One that made me LOL while driving was "My dashund is smarter than your honor student."
Other Favorites:
"Jesus Loves You, Everyone Else Thinks You're an A**hole"
"I don't suffer from insanity, I enjoy every minute of it"
"Normal people worry me"
"I don't mind Jesus, it's his fan club I can't stand"
"Never understimate the power of stupid people in large groups"
"When Guns are outlawed, can we use swords?"
"When catapults are outlawed, only outlaws will have catapults"
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"I do not feel obliged to believe that the same God who has endowed us with sense, reason,
and intellect has intended us to forgo their use."
- Galileo Galilei