⟩ Tell me a snail is at the bottom of a 30-foot well. Each day he climbs up 3 feet, but at night he slips back 2 feet. How many days will it take him to climb out of the well?
Questions like these have become a lot more popular (thanks Google) in recent years. The interviewer isn't necessarily looking for the right answer but instead a little insight into your reasoning abilities.
All you can do is talk through your logic as you try to solve the problem. Don't be afraid to laugh at yourself if you get it wrong -- sometimes the interviewer is merely trying to assess how you deal with failure.
