Oh, come on, a smart guy like you?
It'll be a CHALLENGE.
The Big Bang Theory Season 3, Episode 10
I CHALLENGE you to find a single reference
to Kryptonian skin cells.
The Big Bang Theory Season 1, Episode 2
l'm saying,
where's the CHALLENGE?
Breaking Bad Season 4, Episode 2
Go old-school,
CHALLENGE Stuart to a fight.
The Big Bang Theory Season 5, Episode 10
We've accepted the CHALLENGE.
We can't run away from a fight.
The Big Bang Theory Season 2, Episode 12