You really want to CHALLENGE yourself,
you could learn to speak Hindi.
The Big Bang Theory Season 10, Episode 22
Challenge accepted! Sounds like it's time
for the Sheldon Cooper Apology Tour!
The Big Bang Theory Season 9, Episode 13
Oh, come on, a smart guy like you?
It'll be a CHALLENGE.
The Big Bang Theory Season 3, Episode 10
The CHALLENGE is declined.
Vikings Season 1, Episode 6
She has set me a CHALLENGE
Vikings Season 1, Episode 9