Why was the mirror in a bad mood? It was feeling reflective of its own existence.
Why did the mirror go to the party? Because it was a mirror-image of a good time.
Why did the mirror break up with his girlfriend? He was seeing things from a different perspective.
What did the mirror say to the cat? Who's the real cat around here?
Why did the mirror go to therapy? It had mirror on its own behavior.
Learn more about the philosophical implications of mirrors here