- He’s as sharp as a marble.
- She’s not he brightest bulb on the Christmas tree.
- I wish I had a blueprint for his brain; I’m trying to build an idiot.
- The cheese slipped off her cracker.
- That guy is as smart as bait.
- His elevator doesn’t go all the way to the top floor.
- She forgot to pay her brain bill.
- His antenna doesn’t pick up all the channels.
- If she had another brain, it would be lonely.
- He’s missing a few buttons on his remote control.
- Her receiver is off the hook.
- The lights are on, but nobody’s home.
# posted by Multi-ServiceProvider @ 3:10 PM