Go old-school,
CHALLENGE Stuart to a fight.
The Big Bang Theory Season 5, Episode 10
I CHALLENGE you to find a single reference
to Kryptonian skin cells.
The Big Bang Theory Season 1, Episode 2
I always got stuck on
the first CHALLENGE--
The Big Bang Theory Season 7, Episode 3
Maybe since you're so good,
he's taking his time to meet the CHALLENGE.
The Big Bang Theory Season 6, Episode 6
Some boys like a CHALLENGE.
Game of Thrones Season 2, Episode 10