
He wasn't INSANE.
The Big Bang Theory Season 11, Episode 8

I merely offer you a facial expression
that suggests you've gone INSANE.
The Big Bang Theory Season 3, Episode 12

- Excuse me, this whole idea's INSANE.
- Enough debate. I'm going to take action.
The Big Bang Theory Season 2, Episode 3

Are you INSANE?
The Big Bang Theory Season 2, Episode 12

Sheldon, don't take this the wrong way,
but you're INSANE.
The Big Bang Theory Season 2, Episode 4