Guys vs girls, husbands vs wives, dad's vs moms. Post your pet peeves here

Or when men diet for 3 hours and lose ten pounds, and women diet for 10 years and lose 3 pounds.

and vice versa at my school

Hmmm....

The fact that us ladies can take period jokes pretty well, but the second we make a joke about "manstration" or something like that dudes flip out.