
Relax.
The Big Bang Theory Season 8, Episode 3

Sheldon, RELAX.
She doesn't have any symptoms.
The Big Bang Theory Season 1, Episode 11

Relax, it'll be fine.
The Big Bang Theory Season 5, Episode 3

LEONARD:
Oh, RELAX, he's got headphones on.
The Big Bang Theory Season 4, Episode 24

Howard, RELAX.
I am not interested in your girlfriend.
The Big Bang Theory Season 3, Episode 10