"Doesn't have all his/her cups in the cupboard."

"Barber, Kenneth L." wrote:

> latest list update
>
> "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"
> "Not the brightest crayon in the box, are we?"
> "not the sharpest knife in the drawer"
> "a demitasse cup would fit his head like a sombrero"
> "he would be out of his depth in a parking lot puddle"
> "if you give him a penny for his thoughts ,you get change back"
> "forgot to pay his brain bill"
> "an early example of Peter's Principal"
> "Diagonally parked in a parallel universe."
> "Doesn't just know nothing; doesn't even suspect much."
> "Goalie for the dart team."
> "Immune to caffeine and all other stimulants."
> "when God was passing out brains, he/she thought he said 'rain' and hid
> under a toadstool"