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
Hysterical.
The Big Bang Theory Season 4, Episode 20
Yeah, it's HYSTERICAL.
The Big Bang Theory Season 4, Episode 22
I think I'm HYSTERICAL.
The Big Bang Theory Season 7, Episode 12