- Not the sharpest knife in the drawer.
- Got into the gene pool while the lifeguard wasn’t watching.
- She’s from the shallow end of the gene pool.
- A room temperature IQ.
- Got a full 6-pack, but lacks the plastic thingy to hold them together.
- A gross ignoramus — 144 times worse than an ordinary ignoramus.
- A prime candidate for natural deselection.
- Bright as Alaska in December.
- Nearly as bright as a one celled organism.
- Donated his body to scientists… Before he was done using it.
- Gates are down, the lights are flashing, but the train isn’t coming.
- He’s so dense, light bends around him.
- If brains were taxed, she’d get a rebate.
- If he were any more stupid, he’d have to be watered twice a week.
- If you give him a penny for his thoughts, you get change back.
- If you stand close enough to her, you can hear the ocean.
- One neuron short of a synapse.
- Some drink from the fountain of knowledge, but she just gargled.
- Takes him 1.5 hours to watch “60 Minutes”.
- Was left on the Tilt-A-Whirl a bit too long as a baby.
- Wheel is turning, but the hamster is dead.