I heard something on Raw that I thought was strange. When (I think it was) Cole was describing how the ambulance match worked ("you have to put your opponent into the ambulance and then slam the door"), Lawler then added something like, "The match is over when the ambulance leaves the arena." I don't remember that specific stipulation ever being part of an ambulance match, and if it wasn't, then something tells me that the match is going to end something like this:
(a) Cena puts Kane into the back of the ambulance and slams the door;
(b) The ambulance starts to drive away, then either stops or turns around (and may even try to run over Cena);
(c) Cena goes to yell at the driver, and the door opens to reveal please, please, please, pleasepleaseplease, please, did I mention "please", anybody EXCEPT The Undertaker, who then proceeds to knock Cena out, take Kane out of the ambulance, put Cena in, and drive off.