This first trick i have never seen posted before, for some its common sense tho.
If you are out questing, farming, pvping or anything else in a high level area (level 60+ works if you are level 70). And you got a party member with you. Then duell the party member near alot of mobs and as soon as he accept and the countdown start, then misdirect 2-3 mobs at him. He will have a hart time to win duell and when you win the mobs will kill him. Durability lost
The second trick have been posted before (posting it cause i really like it).
When you are in orgrimmar there is this Cenarion Circle (level 55 tauren) guy outside the tower that flypath go from. If u make Cenarion Circle hostile you can attack this guy. The funny thing to do as a hunter is to random invite a low level, and then misdirect this lvl 55 NPC to him. Then watch him getting killed in orgrimmar.
Another trick: (Thanks Zukini who posted this)
1.) Buff someone with Misdirect
2.) Fire a shot
3.) Sit before the shot lands.
4.) IT doesn't eat a charge of Misdirect.