DING! DING! DING
That's a question we never thought we'd be asking, but Bieber himself has gone ahead and forced us to ponder the possibility.
For reasons that remain unknown, the singer Tweeted a challenge to the actor over the weekend, writing very simply and mysteriously on his account:
I wanna challenge Tom Cruise to fight in the octagon.
Tom if you dont take this fight your scared and you will never live...