Why is a manhole cover round?
How many cows are in Canada?
How would you cure world hunger?
On a slow day, when we're not on a coding sprint or putting out a fire, we'll huddle in the break room and discuss these type of questions. Otherwise, it typically doesn't come up. I'd never ask something like this during an interview. 😛
"Do not seek to follow in the footsteps of the wise. Instead, seek what they sought." - Matsuo Basho