My son is driving me up the wall!! Can anyone else relate?

He has always been such a sweet and good boy and he still is, but he's gotten so much more defiant, his tantrums are as bad as ever and his evolving "sense of humor" does not strike me as very funny. I feel sooooo bad because I know he's just being playful but whenever I need to get him dressed or tell him to wash his hands or whatever, he runs and hides and thinks it's hilarious. It is not hilarious! Put on your damn pants!

Can anyone else sympathize? I feel like such an evil, humorless biotch these days.