So, I was questing as usual in Dragonblight, when I received an interesting quest.
Bombard the Ballistae - Quest - World of Warcraft
The quest provides You a pack of bombs, which are used to destroy ballistas. But, there was nothing about specified place where to use or on what to use. So I decided to check thottbot, and yes, I thought right - You can use them anywhere.
If you are a paladin or you just have problems with pulling, then this is great. This is also great in PvP, it deals no damage, but it confuses enemy. Mage blink + this = awesome.