M&P B-sides.

"Hey, you know the multiverse theory?"

Matt paused whatever degrading experiment he was putting Penny through. "Yeah? What about it?"

Penny giggled. He was so cute when he was grumpy. "Well, what if there are other versions of us - just like us, but doing different things?"

She moaned as Matt continued to violate some taboo or boundary. "You mean like small vignettes that aren't necessarily part of the main continuity?" Matt asked.