You really want to CHALLENGE yourself,
you could learn to speak Hindi.
The Big Bang Theory Season 10, Episode 22
I see no other option than
to CHALLENGE you to a duel.
The Big Bang Theory Season 5, Episode 17
We've accepted the CHALLENGE.
We can't run away from a fight.
The Big Bang Theory Season 2, Episode 12
l'm saying,
where's the CHALLENGE?
Breaking Bad Season 4, Episode 2
You want a real CHALLENGE,
try keeping me from eating more of these.
The Big Bang Theory Season 10, Episode 22