First of all, I did not see this on the website, so if this is here, just disregard.
Also this isn't a very BIG COOL thing, but it is useful and funny.

Blizzard allows players to enter an instance only a few times a day.

1. Enter any instance as many times as you can. Until it says that you no longer enter any for the rest of the day.
2. Whenever you have this effect on you, walk through the instance swirls, and wait or skillfully lead the opposite factiont to it.
3. Begin ranged or casting DPS. Whenever the enemy tries to attack you (assuming they are melee) they will zone into the instance, leaving you untouched.

I had some fun outside Hellfire Ramparts doing this with my mage. Killed a 70 warrior at 62 being untouched

Like I said, this isn't all that useful in common situations, but it IS pretty funny if you're willing or bored.

that is a pretty funny little trick, im not sure why i didnt think of that! haha

It also works if an instance is full or if you are not in a raid trying to zone into something like Karazhan.

also.. you can be in azeroth and click to be in a heroic for a dungeon that does not allow heroic.. then kill lower lvls all day in sm or other locations.. when I higher lvl comes switch it off and you can step out and in to safety

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