In elementary school, I hated word problems because I kept thinking of things that weren't specified which prevented there from being just one right answer. Sure, the car left City A at 60 miles per hour, but what if there's a stop-light? I know there are lots of stoplights, so it must go slower, and you didn't tell me how much slower it would go...

I like to think that I've turned it into an asset when it comes to software. ("We don't know that the first parameter won't be null...")