
Ragnar said that
if you refuse his CHALLENGE,
Vikings Season 1, Episode 6

All right, we've defeated the first CHALLENGE.
The Big Bang Theory Season 8, Episode 19

Maybe you need to CHALLENGE
your motor skills.
The Big Bang Theory Season 10, Episode 22

We've accepted the CHALLENGE.
We can't run away from a fight.
The Big Bang Theory Season 2, Episode 12

Maybe since you're so good,
he's taking his time to meet the CHALLENGE.
The Big Bang Theory Season 6, Episode 6