Driveway doesn't quite reach the garage/street.
Any slower and he'd be in reverse.
Easier to count the bricks left than the bricks missing.
Even a two button mouse gives him too many options.
Got a life, but wasn't sure what to do with it.
Has been seen tossing bread crumbs to helicopters.
Has two brains; one is lost and the other is out looking for it.
Her sewing machine's been out of thread for some time now.
Lives in the same world, but a different universe.
And Abraham did look at her as though she were several saddle bags short of a camel load."
"Duh!" on parade.
24 cents short of a quarter.
A .22 caliber intellect in a .357 Magnum world.
A 1.0 in a 3.5 installation.
A 20th century man. The guy has no future.
A 3.5-inch drive, but data on punch cards.
A bad case of colon nose.
A barnacle on the ship of progress.
A black-and-white mind working on a color-coded problem.
A brain like a BB in a boxcar/box of Corn Flakes.
A butter knife in a steak/prime rib world.
A couple of blocks behind the parade.
A day late and a dollar short.
A deadbolt with a broken cylinder.
A dim bulb in the marquee of life.
A face designed for radio.
A face designed in a wind tunnel.
A few beers short of a six-pack.
A few bricks shy of a full load.
A few clowns short of a circus.
A few dice short of a full bag/role-player.
A few feathers short of a whole duck.
A few fries short of a Happy Meal.
A few peas short of a casserole.
A few photons short of a hologram/holodeck.
A few planets short of a federation
A flash of light, a cloud of dust, and. What was the question?
A great deal of pride, but very little to be proud of.
A gross ignoramus - 144 times worse than an ordinary ignoramus.
A hemorrhoid on the face of the world.
A hop, skip, and jump from success, but to get there he'd have to give up
chewing gum.
A kangaroo loose in her top paddock.
A lap behind the field.
A legend in his own mind.
A logically defunct twit.
A looney tune.
A lot of feathers but not much chicken.
A medical mystery.
A mental midget with the IQ of a fencepost.
A mind like wet tennis shoes. Makes squishy noises when running.
A minefield of information.
A modest little person, with much to be modest about.
A natural talent for finding subliminal messages in ice cubes.
A Neanderthal brain in a Cro-Magnon body.
A notch off the timing mark.
A one-bit brain with a parity error.
A pacifist out of necessity/always loses in a battle of wits.
A PBS mind in an MTV world.
A peripheral visionary.
A person of rare intelligence. It's rare when he shows any.