Ragnar said that
if you refuse his CHALLENGE,
Vikings Season 1, Episode 6
or a CHALLENGE to the system.
Money Heist Season 3, Episode 8
Challenge accepted! Sounds like it's time
for the Sheldon Cooper Apology Tour!
The Big Bang Theory Season 9, Episode 13
I have no doubt
you will prove equal to this CHALLENGE.
Game of Thrones Season 3, Episode 3
Challenge accepted.
The Big Bang Theory Season 1, Episode 2