I have a bunch on my
homepage but my favorites are:
If at first you don't succeed, skydiving isn't for you.
I think animal testing is a terrible idea; they get all nervous and give the wrong answers.
And
Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.
I like the quote from daan, very cute