I’ve written out about half a pad’s worth of goofy post-its. My favorites so far:
“Shut up, you’re not fat.” (For the ladies’ room mirror)
“Everything will be okay.”
“How do you tell the sex of a chromosome? Pull down it’s genes!”
“What do clouds wear under their clothes? Thunderwear.”
and
“Build a man a fire and he will be warm for a day. Set a man on fire and he’ll be warm the rest of his life.”

Now to post them!