"A collection of insults 10" joke

In line for brains, thought they said were handing out milkshakes, and he asked for "extra thick."

In need of a ROM upgrade.

In serious need of attitude adjustment.

In the shopping mall of the mind, he's in the toy store.

In touch with her higher power, but out of touch with the rest of us.

Includes a "thank you" note with her tax returns.

Infinite space between her ears.

Informationally deprived.

Inhabits her own private timezone.

Inspected by #13.

Inspired the slogan, "A mind is a terrible thing to waste."

Intellectually/synaptically challenged.

Invented a pencil with an eraser on each end.

Invented a submarine with a screen door.

IQ = dx / (1 + dx), where x = age.