Don't piss off the universe.

Ted: So what do you think?

Barney: Robin again? Ted, the universe clearly does not want you and Robin to be together. Don't piss off the universe. The universe will slap you.

Ted: Don't you think the universe has more important things to worry about than my dating life?

Marshall: Unless your dating life is the glue holding the entire universe together. Whoa, chills. Anybody else get chills?

Ted: Look, I realize we've been down this road before, but the fact is, whatever I do, it all keeps coming back to Robin. So I gotta do this.

[Barney slaps Tedd]

Ted:  What the hell?

Barney: That wasn't me. That was the universe.