Zone.
The Big Bang Theory Season 7, Episode 6
Oh, you don't wanna do that,
it's a construction ZONE.
The Big Bang Theory Season 10, Episode 7
No, no, no, no.
The ZONE ZONE is a safe ZONE.
The Big Bang Theory Season 12, Episode 14
And remember that I laughed
at your "ZONE ZONE" joke.
The Big Bang Theory Season 12, Episode 14
You need to push your brain out of its
comfort ZONE and reach mental exhaustion.
The Big Bang Theory Season 10, Episode 22