This one's hard to tell. On his way back to the locker room after "beating" The Beast at SummerSlam, The Undertaker collapsed just before disappearing backstage. Was this real or part of the show? Let's break it down a little bit.
Reasons it could be real: No one could really see him at that point, so why would he collapse for a small section of fans to see?
Reasons it could be fixed: No one rushed out to help Taker and he slowly moved backstage on his own power. Also, PWInsider has noted that they've heard nothing about an actual injury for The Deadman.
It was a strange end to SummerSlam overall between the finish of the match and the way Taker left the ring, so we'll be looking forward to Raw tonight to get some answers!