Euphemisms for Stupid People

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A few beers short of a six-pack.
A few fries short of a Happy Meal.
A room temperature IQ.
All foam, no beer.
Backstreet Boy in a Talking Heads world
Body by Fisher, brains by Mattel.

Couldn't pour water out of a boot with instructions on the heel.
Lift doesn't go all the way to the top floor.
Got a full 6-pack, but lacks the plastic thingy to hold it all together.
He fell out of the Stupid tree and hit every branch on the way down.
His antenna doesn't pick up all the channels.
His belt doesn't go through all the loops.
Missing a few buttons on his remote control.
Still cutting with rounded scissors.
The wheel's spinning, but the hamster's dead.