A few clowns short of a circus.
A few fries short of a Happy Meal.
An experiment in Artificial Stupidity.
A few beers short of a six-pack.
Dumber than a box of hair.
A few peas short of a casserole.
Doesnt have all his corn flakes in one box.
The wheels spinning, but the hamsters dead.
One Froot Loop shy of a full bowl.
One Taco short of a Combo Meal.
A few feathers short of a whole duck.
All foam, no beer!
The cheese slid of his cracker.
Body by Fisher Price, brains by Mattel.
Has an IQ of 2 but it takes 3 to grunt.
Warning: Objects in mirror are dumber than they appear.
Couldnt pour water out of a boot with the instructions on the heel.
Too much yardage between the posts.
An intellect rivaled only by garden tools.
As smart as bait.
Chimneys clogged.
Doesnt have all his dogs on one leash.
Doesnt know much, but leads the league in nostril hair.
Elevator doesnt go all the way to the top floor.
Forgot to pay his brain bill.
Her sewing machines out of thread.
Her antenna doesnt pick up all the channels.
His belt doesnt go through all the loops.
If he had another brain, it would be lonely.
Missing a few buttons on her remote control.
No grain in the silo.
Proof that evolution can go in reverse.
Receiver is off the hook.
Several nuts short of a full pouch.
He fell out of the Stupid Tree and hit every branch on the way down.