You're birthday isn't on April 1st but you're still a Fool.
That boy's about as sharp as the leading edge of a bee-bee.
Her underarms are so hairy it looks like she has Buckwheat in a headlock.
When they were handing out brains you were late. All you got was a rain check. You didn't get a brain that day either. They were only handing them out to people who would use them.
Insultee: I just came back from the beauty parlor. You: What a pity it was closed.
You got your brain very early. Apparently the warranty has run out.
Insultee: Do you think I'll lose my looks as I get older? You: With luck, yes.
You've got a face like a million dollars...all green and wrinkled.
Don't look out the window or people will still think it's Halloween.
Brains aren't everything. In fact, in your case, they are nothing.