Although crashing taunt parties can be fun, joining them is fun too. Just learned that today.
I was Sonic, we had a Mario, Ness, and Zelda on Hyrule. Obviously, it became a taunt party. At first it was Mario and I going at it, until I saw Ness and Zelda just standing around throwing random attacks out of sheer amusement. So I kept running from Mario and taunted when I could. Mario got upset that he tried so hard to catch me (obviously, too slow), and the next match (same people), we all teamed up on him. We killed him and went to sudden death, the Ness, Zelda, and I.
Sudden death was a blast XD