You probably know that some quest itens can be used anywhere, on anyone, but they're mostly Roleplaying itens (Only visual effects, nothing really useful), But this one has proved to be very useful:
Rejek's Blade - Item - World of Warcraft
It's an item from a quest in Sholazar Basin that can be used anywhere, along with many other quest items (at least on the server I play), It's solid and stackable. You just have to target yourself, use the item, jump, use it again, jump another time, ??? and profit.
It's obviously useful, but if you can't find any use for it, I'll point some:
1. Leave your starting point at BGs before everyone else
2. Aggro bosses from places you shouldn't
3. Block passages (For some seconds)
4. Escape from melee (Great at arenas)
5. Reach amazing ganking spots
6. Never get banned for using the Wallclimb hack again!
7. Brag to your friends about how uber you are by getting to an unreachable place
8. Cheat in Stairwells courses in some servers
And much more!
Happy Exploiting