He'd never been one to compete, especially not with his friends.
So when Dean started trying to introduce the concept to him, he didn't catch on easily.
"Dean, I don't know why we're doing this."
"Because we're in a bar and that's what you do."
"This seems like a violent pastime."
"Just throw the freaking dart, Cas."
He did. It went straight into the center.
Dean's jaw dropped. "You did not just-"
"There is no challenge for me, Dean. I do have "mojo", after all."
He definitely wasn't one to compete with his friends. After all, there was no competition.