
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