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"one brick shy of a load."
"The lights are on, but nobody's home."
"elevator does not go to the top"
"a few crackers short of a box"
"a few pickles short of a barrel"
"a sandwich short of a picnic"
"A couple french fries short of a Happy Meal"
"Not playing with a full deck"
"All his/her oars are not in the water."
"Kangaroos in the top paddock"
"If he/she had half a brain their head would rattle"
"He/she has two brain cells, one's out looking for the other"
"in a battle of wits, he/she is unarmed"
"His/her brain is like a camera, one bright flash and it's over."
"Bats in the belfry"
"lost their marbles"
"Half a bubble off plumb"
"A few beans short of a burrito"