“You have been shrunk to the size of a pencil and dropped into a blender. The blades will start spinning in 60 seconds. What do you do?”
This is the most absurd brainteaser in the Microsoft canon, and the cleanest example of how far the brainteaser tradition went into pure surrealism before the format collapsed in the 2000s. The question is unfalsifiable, has no real solution, and tests no skill that maps to anything a software engineer does on the job. By the time it appeared in William Poundstone’s 2003 book How Would You Move Mount Fuji?, it was already a parody of itself, asked half-ironically by interviewers who were tired of the format and starting to wonder why they were doing this.
The “answer”
The conventionally-rehearsed answer was something like: “I would jump out of the blender. At pencil size, my muscles would be relatively much stronger compared to my body weight — the square-cube law means I would be proportionally stronger, like an ant lifting many times its weight. So I should be able to jump out before the blades start.”
This is technically the kind of clever-physics reasoning the question was supposed to elicit. The square-cube law is a real concept; the answer demonstrates that the candidate has heard of it. The interviewer was supposed to grade the candidate on “did they reach for a clever physics observation” rather than on whether jumping out is actually feasible.
Other “good” answers: lie flat at the bottom under the blades, climb the walls, scream for help. The full enumeration was supposed to demonstrate that the candidate could brainstorm under absurd constraints.
The genre
The blender question was part of a broader category of absurdist Microsoft brainteasers that included:
- “You are stuck in a Schrödinger’s cat-style box.” Various physics-themed absurd scenarios.
- “You are a chocolate bar in a chocolate factory.” Anthropomorphic-product hypotheticals.
- “What is the funniest thing about you?” Personality-as-puzzle questions.
- “If you could be any household appliance, what would you be?” The animal-question variant.
- “How would you explain HTML to your grandmother?” Audience-translation puzzles.
The genre claimed to test creative thinking, the ability to engage with absurd hypotheticals, and tolerance for ambiguity. In practice, the genre tested whether the candidate had read the same prep books as the interviewer and was willing to play along with the convention.
Why it died
The absurdist brainteasers retired faster than the more “respectable” Fermi estimation questions because they were obviously silly. By 2010, asking the blender question seriously had become embarrassing. The interviewers who continued to ask it did so with overt irony, signaling to the candidate that they did not really care about the answer and were just running through the format.
Two specific causes for the decline:
- The 2003 Poundstone book. Once the questions were collected and made public, every candidate had pre-rehearsed answers, and the spontaneous-creativity premise of the format dissolved.
- The empirical retreat across the industry. When companies started measuring whether brainteaser performance predicted job performance, absurdist brainteasers showed even less correlation than Fermi questions did. The Fermi questions at least exercised quantitative reasoning; the absurdist ones exercised nothing except willingness to play along.
By the time of Laszlo Bock‘s 2013 New York Times retreat, the absurdist brainteasers were already extinct in serious tech interviewing. Bock’s statement applied formally to the Fermi tradition; the absurdist tradition had quietly died several years earlier.
What candidates were supposed to demonstrate
The theoretical case for the format, articulated by interviewers who used it earnestly, was that it tested four things:
- Tolerance for absurdity. A candidate who refused to engage with the premise was disqualified.
- Lateral thinking. The “right” answers required jumping outside the normal frame — the square-cube law, the blender’s physical structure, the time constraint as a problem-solving variable.
- Composure. Answering an absurd question without flinching was supposed to signal professional poise.
- Humor. A candidate who could engage with the question lightly without taking it too seriously was scored higher.
None of this was wrong, exactly. The criticism was that the same skills could be tested with questions that were not insulting to the candidate’s professional self-respect. A candidate has every right to feel that an interview where they are asked about being shrunk into a blender is not a serious evaluation of their engineering ability.
The cultural memory
The absurdist brainteasers survive in cultural memory as the punchline of the brainteaser era. When someone in 2026 wants to mock outdated interview practices, they reach for the blender question, not the manhole cover question. The blender is the symbol of “interviews that didn’t measure anything but were inflicted on a generation of candidates anyway”.
The Poundstone book itself is now read mostly as historical artifact. Engineers who started their careers in the 2010s or later have never been asked these questions in earnest, and the book serves as a window into how the previous generation of tech hiring worked rather than as preparation material.
Is anyone still asking these in 2026?
Essentially no. The absurdist brainteasers are extinct in serious technical interviewing. Asking the blender question earnestly in 2026 would signal a process so outdated that the candidate should probably decline to advance.
The exception: some startup founders who have read books from the 1990s and want to “test creative thinking” sometimes ask milder versions (“if you were stuck on a desert island…”). These are usually not deal-breakers if you handle them gracefully, but they do signal that the company has not invested in modernizing its interview process. Whether that is concerning depends on the rest of the loop.
Frequently Asked Questions
What’s the “right” answer to the blender question?
The conventionally-praised answer involves the square-cube law — at pencil size your relative strength is much higher, so you can jump out before the blades start. Whether this is correct in any meaningful physical sense is debatable; the interview convention treated it as the canonical answer.
Why did Microsoft ask these?
The hiring philosophy of 1990s Microsoft placed enormous weight on “raw cognitive ability” and on testing how candidates handled novel, absurd problems. The premise was that smart candidates could learn anything specific later but had to be able to reason about unfamiliar scenarios. Whether this premise was correct (and whether the brainteasers tested it well) is what the industry eventually rejected.
Are these questions still asked anywhere?
Essentially no in serious tech. Some startup founders ask milder versions. They are essentially extinct at FAANG, AI labs, fintech, and quant firms.
What was Poundstone’s role in the genre?
His 2003 book How Would You Move Mount Fuji? collected and published the canonical Microsoft brainteasers, which made the format public knowledge and accelerated its retirement. After the book, the questions were universally pre-rehearsed and lost their interview value.
What replaced these questions?
LeetCode-style coding for cognitive ability, structured behavioral interviews for personality and culture, and system design rounds for architectural thinking. None of the modern formats include surrealist hypotheticals.