When she opens her mouth, it seems that this is only to change whichever foot was previously in there.

He’s so dense, light bends around him.

He would be out of his depth in a parking lot puddle.

If brains were taxed, he’d get a rebate.

She sets low personal standards and then consistently fails to achieve them.

If he were any more stupid, he’d have to be watered twice a week.

This employee should go far – and the sooner he starts, the better.

If you give him a penny for his thoughts, you’d get change.

Got into the gene pool while the lifeguard wasn’t watching.

If you stand close enough to him, you can hear the ocean.