Nice expressions to describe dumb people:

• Not the sharpest knife in the drawer.
• A few clowns short of a circus.
• A few fries short of a Happy Meal.
• A few Cokes short of a six-pack.
• A few peas short of a casserole.
• The wheel's spinning, but the hamster's dead.
• One taco short of a combination plate.
• A few feathers short of a whole duck.
• All foam, no beer.
• The cheese slid off his cracker.
• Couldn't pour water out of a boot with instructions on the heel.
• He fell out of the stupid tree and hit every branch on the way down.
• An intellect rivaled only by garden tools.
• As smart as bait.
• Chimney's clogged.
• Doesn't have all his dogs on one leash.
• Forgot to pay his brain bill.
• Her sewing machine's out of thread.
• His belt doesn't go through all the loops.
• No grain in the silo.
• Proof that evolution CAN go in reverse.
• In the pinball game of life, his flippers were a little further apart than most.