Brain like a hard drive with no read/write head.
Brain permanently in power saving / 8-bit mode.
Brain transplant donor.
Bright as a Zippo lighter without a flint.
Bright as Alaska in December.
Bright as an acetylene torch -- without an oxygen supply.
Brings binoculars to submarine races.
Broadcasts static.
Bubbles/leaks in her think tank.
Built a special showcase for his herd of pet rocks.
Busier than a one-armed paper hanger.
Caboose seems to be pulling the engine.
Cackles a lot, but I ain't seen no eggs yet.
Calling her stupid would be an insult to stupid people.
Calling him a pea brain would be an undeserved compliment.
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