I'm new to the MMO scene. I've beta tested Guild Wars and The Matrix Online.
I like the dancing (it's my feminine side emerging!). Actually, I like it because it's something I can't do in real life! It's simple: just hit /dance .
Here are some great dance videos:
Supposedly The Matrix Online provides for interlocked dancing where two people can dance together in a syncronized way. But I haven't found a video of that yet.