MTV Producers have said that it was staged. And that that is how it was rehearsed at Dress Rehearsal.
Eminem can actually act. Maybe he's also gotten a sense of humour. Who know what down time and desperation can do for someone.
If not HA HA to eminem...he can dish it like no other, god forbid someone one up him. It seems like he doesnt like to be on the other side of a rude prank or joke like a spoiled litte brat.