You hate it when you solve a long math problem and your answer ends up being zero. It's like you did all that work, literally, for nothing. amirite?

It's even worse when it ends up being no solution

Anytime I get zero I make sure to check with someone else; I'm just too suspicious of it for some reason.

I actually like it when that happens. It's just so neat and simple of an answer, versus something like 2.567pi. I feel like it's right, too, because it's too much of a coincidence.

Recently (being this past school year) i've actually taken to checking 0 and 1 as answers before i do any work. saves you time more often than you'd think (and if 1's an answer check -1 too).