Doing something, anything to take my mind off of being in a bad mood. For instance, going to a movie or a bike ride. Or you can just roll with the bad mood. Sometimes it almost feels good to be in a bad mood. Is that weird? I hate it when you're in a really good bad mood and someone comes along and cheers you up. Lol. Of course, afterwards I'm always thankful they did. Also try listening to some music.