Okay, so I was playing around with the new dalaran city and looking through the shops when i found the toy shop. I was like, cool a toy shop. I went in and bought everything but the train. Including with this is the paper zepplin creation kit, which lets you make a zepplin and throw it at people, landing in their inventory. Nothing suspicious there right? WRONG!! If you buy one of these and make one, theres still 4 charges left in the kit. Try to make another one and you will have the error that you can't make more. Heres the fun part, take that kit and give it to your friend, then tell him to make one, watch for his toon to start making it, then take the zep that you made and throw it at him. When he finishes makin his, he will have 2 in his inventory and it will crash his game.
tl;dr version
1. Buy a zepplin kit from toy shop in dalaran
2. Make a zep
3. Give plans to friend
4. tell friend to make one
5. while friend is makin one throw your zep at him
6. lol
I searched and didn't find this blah blah.
P.S. it won't look like he D/Ced in game, if he starts up his game fast enough it will look like hes just standing there, but you know it works cause hell call you names.