It would more kind to call them "special."

Listen, I make fun of my kids as much as the next person...neither of them is going to get a spelling scholarship, if you know what I’m saying. But putting a sign out on the street telling the world they’re slow? That's just plain mean. Thanks for the warning, though - I'll be sure not to yell algebra problems out the window as I pass your house.

Say, here’s a thought: maybe if you didn’t dress them in those creepy “See Dick” outfits they’d be a little more with it. Perhaps it's the lederhosen holding them back.