25 politically correct ways to say someone is stupid:

 1. Not the sharpest knife in the drawer.
 2. A few clowns short of a circus.
 3. A few fries short of a Happy Meal.
 4. A few beers short of a six-pack.
 5. Dumber than a box of rocks.
 6. Doesn't have all his corn flakes in one box
 7. The wheel's spinning, but the hamster's dead.
 8. One taco short of a combination plate.
 9. All foam, no beer.
10. The cheese slid off his cracker.
11. Has an IQ of 2, but it takes 3 to grunt.
12. Warning: Objects in mirror are dumber than they appear.
13. Couldn't pour water out of a boot with instructions on the heel.
14. He fell out of the Stupid tree and hit every branch on the way
     down.
15. An intellect rivaled only by garden tools.
16. Chimney's clogged.
17. Elevator doesn't go all the way to the top floor.
18. Her sewing machine's out of thread.
19. His antenna doesn't pick up all the channels.
20. If he had another brain, it would be lonely.
21. Missing a few buttons on his remote control.
22. Proof that evolution CAN go in reverse.
23. Receiver is off the hook.
24. Several nuts short of a full pouch.
25. Too much yardage between the goal posts.