Discovered something funny today while I was bored in the Hearts of Mist. I managed to pull up 2 of the Class Dummy's on top of the stone pillars. Once they are up there they won't move back to their original position unless they are killed. However, 99% of the people won't look up there, so you can make them stuck for quite a while.
1. Walk up the pillar thingies.
2. Attack the Class Dummy with a ranged attack (this only works on the Mesmer and Engineer).
3. Let them kill you, once you are in the 'downed phase' they will port up there to finish you off.
4. Use one of your downed abilities to escape and heal back up.
5. Done.
This is completely useless, but can be quite entertaining while you are looking/waiting on a tournament group.
Edit: You can also kite/pull them anywhere you want to. With this method, I managed to pull all 4 trainers somewhere behind a mountain. There is now no trainers on my server :P