When I buy socks, I throw all my old ones out and buy 21 new pairs.

Here's my favorite high school math word problem:

Q: If you have blue socks, red socks and white socks, what is the smallest number greater than 0 of socks that you have to pull out of your drawer to get a pair?

A: n+1 where n is 3 because you have 3 different colors.

Well, this way I only ever have to touch two socks!