Here's a couple more I've thought of...
1. A kid wins the opportunity to spend the evening with their favorite popstar, and is really excited about it because not only is the popstar really talented, but really dreamy as well... or so they think, then when they spend the evening with said popstar, they learn that they don't even do their own singing/vocals/talent, and that they're pretty much egomaniacs who don't even care about who their guest of the evening is, thus losing a fan in the process.
2. The age-old (going all the way back to Lucy) one half is sick of the other half's filthy lifestyle, thus prompting the entire residence to have a line taped right down the middle of everything and "There, you stay on your half, and I'll stay on mine", resulting in some minor inconveniences, as some of the things they need are on the other's half, and as a way of gloating, refuse to give the up.