"A collection of insults 41" joke

If stupidity were a crime, he’d be number one on the Most Wanted list.
If the government ever declared war on stupidity, he’d get nuked.
If there were a merciful God he’d be dead by now.
If they each had half a brain, they’d still only have half a brain.
If they knock heads, implosion will suck all the air out of the room.
If what you don’t know can’t hurt you, she’s practically invulnerable.
If you called him a wit, you’d be half right.
If you give him a penny for his thoughts, you get change back.
If you stand close enough to him, you can hear the ocean.
Ignorant, and proud of it.
Immune from any serious head injury.
Immune to caffeine and all other stimulants.
In a tub of Preparation H, he’d shrink down to thumb size.
In his optimum environment, he’d be locked in a life and death struggle with mushrooms.
In line for brains, thought they said pains, and said, “No, thanks”.