Well my bud, wat ur actually doing is downing ur self its an easter egg. I mean that diving over ur friend puts u down is the easter egg, hence the laughter when u get a teddy from the box (happens when 2 people go into a teleporter at same time on "five" too). Then when u go down the game has a script and depending on how many times u go down the game figures out how "bad" u r at zombies and so the worst u do the more power ups it gives u to try to help u.