#3 Shawn Michaels' back injury
The Undertaker and Shawn Michaels are two of the best wrestlers in the sport’s history. But whenever the two come together, the chances of botches increase. This was proven once again in about between the two legends.
Royal Rumble 1998 saw the two men go against each other in a casket match. During the match, Taker performed a running backdrop on Michaels outside the ring on the side where the casket was placed.
The result wasn’t as expected, as HBK wasn’t able to control his landing, and the casket struck the small of his back at the base of his spice. The move left Michaels with two herniated discs and one crushed disc in his lumbar spine.
The injury left him unable to compete for some time and resulted in him not wrestling again until 2002. It's also said that the injury caused him trouble throughout the remainder of his career before he retired.