1. A few clowns short of a circus.
2. A few fries short of a Happy Meal.
3. An experiment in Artificial Stupidity.
4. Too much yardage between the goal posts.
5. Dumber than a box of hair.
6. A few peas short of a casserole.
7. Doesn't have all his cornflakes in one box.
8. The wheel's spinning, but the hamster's dead.
9. One Fruit Loop shy of a full bowl.
10. One taco short of a combination plate.
11. A few feathers short of a whole duck.
12. Surfing in Nebraska.
13. The cheese slid off his cracker.
14. Body by Fisher, brains by Mattel.
15. Has an IQ of 2, but it takes 3 to grunt.
16. Warning: Objects in mirror are dumber than they appear.
17. Couldn't pour water out of a boot with instructions on the heel.
18. He fell out of the Stupid tree and hit every branch on the way down.
19. An intellect rivaled only by garden tools.
20. As smart as bait.