#3 Undertaker vs. Mankind - King of the Ring 1998
Perhaps the most infamous example of Foley's insanity came on this date (June 28, 1998) when Foley, working as his Mankind character, met up with Undertaker for the third ever Hell in a Cell match.
Instead of starting the match in the ring and working his way out of the cage, Foley wanted to climb up the ante, while Taker followed. The two wrestlers battled back and forth along the top of the cage. After some brawling and a few chair shots, they teetered near the edge.
Undertaker grabbed Mankind and sent him flying off the cage onto the table, some 16 feet below which separated his shoulder. Unbelievably enough, it didn't end there. As the medical team was wheeling Mankind out, he got up and headed to climb the cage again while Taker was still on top.
The match continued and Foley was chokeslammed twice, one crashing down the ring from the cage and the next one on the pile of thumbtacks. All that was left was a tombstone piledriver to get the three count to mercifully bring to an end of one of the most gruelling matches in WWE history.