Some companies are more unconventional when it comes to interviewing prospective employees, according to a compilation by career website Glassdoor.

While most organisations are content to ask candidates why they are keen on the job, these are some which have caught interviewees off guard.

"How many people are using Facebook in San Francisco at 2:30 p.m. on a Friday?"

Company: Google
Position: Vendor Relations Manager

"Just entertain me for five minutes; I'm not going to talk."

Company: Acosta
Position: Leadership Development Program Associate

"If Germans were the tallest people in the world, how would you prove it?"

Company: Hewlett-Packard
Position: Product Marketing

"Given 20 'destructible' light bulbs (which break at a certain height), and a building with 100 floors, how do you determine the height that the light bulbs break?"

Company: QUALCOMM
Position: Engineering

"If you could be #1 employee but have all your coworkers dislike you or you could be #15 employee and have all your coworkers like you, which would you choose?"

Company: ADP
Position: Inside Sales Associate

"How would you cure world hunger?"

Company: Amazon.com
Position: Software Developer

"Room, desk and car - which do you clean first?"

Company: Pinkberry
Position: Shift Leader

"Does life fascinate you?"

Company: Ernst & Young
Position: Tax Analyst

"Please spell 'diverticulitis'."

Company: EMSI Engineering
Position: Account Manager

"Name 5 uses of a stapler without staple pins."

Company: EvaluServe
Position: Business Analyst

"How many different ways can you get water from a lake at the foot of a mountain, up to the top of the mountain?"

Company: Disney Parks & Resorts
Position: Project Engineering Intern

"What is 37 times 37?"

Company: Jane Street Capital
Position: Assistant Trader

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