Challenge accepted! Sounds like it's time
for the Sheldon Cooper Apology Tour!
The Big Bang Theory Season 9, Episode 13
Ragnar said that
if you refuse his CHALLENGE,
Vikings Season 1, Episode 6
I have no doubt
you will prove equal to this CHALLENGE.
Game of Thrones Season 3, Episode 3
She has set me a CHALLENGE
Vikings Season 1, Episode 9
We've accepted the CHALLENGE.
We can't run away from a fight.
The Big Bang Theory Season 2, Episode 12