
He does this HYSTERICAL impersonation
of Stephen Hawking having phone sex.
The Big Bang Theory Season 2, Episode 11

That's HYSTERICAL.
The Big Bang Theory Season 7, Episode 15

I think I'm HYSTERICAL.
The Big Bang Theory Season 7, Episode 12

Yeah, it's HYSTERICAL.
The Big Bang Theory Season 4, Episode 22

Hysterical.
The Big Bang Theory Season 4, Episode 20