Has the attention span of an overripe grapefruit.
Has the brains of a house plant.
Has the Grand Canyon under the crew cut.
Has the IQ of a salad bar / an ice cube / three below houseplant.
Has the keen awareness of an ostrich in hiding.
Has the mental agility of a soap dish.
Has the personality of a snail on Valium.
Has the same talent as Dr. Doolittle.
Has two brains; one is lost and the other is out looking for it.
Hasn't caught on that X and Y are relative values.
Hasn't got all his china in the cupboard.
Hasn't got the brains God gave a cat.
Having a party in his head, but no one else is invited.
He can only type in upper case.
He can push but he can't pop.
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