It's not SAD, it's great.
The Big Bang Theory Season 7, Episode 18
I'm SAD for real now!
The Big Bang Theory Season 7, Episode 4
Hulk SAD.
The Big Bang Theory Season 3, Episode 12
Oh, I'm sorry.
I don't know your SAD song.
The Big Bang Theory Season 3, Episode 1
Oh, that's SAD.
It is.
The Big Bang Theory Season 7, Episode 19