Not really sure this has any way of being exploited or anything, but..
If you're in cat form and have Mangle (cat) ability.. and you target a mob in melee range and hit him w/ mangle (cat).. and just before the mangle goes off target a mob an infinite distance away (just need to see it) it'll hit the melee-range mob with the damage, and the ranged mob with the mangle debuff pulling the mob.
Almost wiped a few times in groups finding out what triggered this bug.
One thing this could be used to do is pull a mob from any distance (hit a critter in melee and pull a distant mob for example).
Also... if you make a macro to target a boss that's say, behind a wall (like Underbog instance entrance for example) I'm thinking you could pull the boss and enter the room for the encounter. (make the macro '/cast Mangle (cat)' and then '/target The Black Stalker' or w/e)