I would love, love, love, LOVE to do a PSL loosely based off this video. Warning: Sheldon/Penny pairing. BUT, let me say this at least- I don't want this to be an instant romance. Something long-term and a growing relationship-turned-friendship-turned-something-more. This could take years (PSL time, not RL time) or maybe not as long. It could start as an 'experiment' on either side and then the two team up for some kind of competition. OR, Leonard ends up getting married and moves out, leaving an empty room for Penny to take for whatever reason (maybe she convinces Sheldon to let her live there so that she can save money and after she agrees to signing up the longest roommate agreement contract ever). I'd love to hear more ideas if anyone out there is interested in giving this pairing a try.