You really want to CHALLENGE yourself,
you could learn to speak Hindi.
The Big Bang Theory Season 10, Episode 22
Oh, come on, a smart guy like you?
It'll be a CHALLENGE.
The Big Bang Theory Season 3, Episode 10
She has set me a CHALLENGE
Vikings Season 1, Episode 9
Some boys like a CHALLENGE.
Game of Thrones Season 2, Episode 10
I have no interest in playing a game
in which I find no CHALLENGE.
The Big Bang Theory Season 3, Episode 5