#2 The Undertaker gets set on fire for real
To this day, this remains one of the most terrifying entrance botches in wrestling history because of how awful it looked.
As the Undertaker made his way to the ring for an Elimination Chamber match, the columns of fire that composed a part of his entrance at the time were mistimed. As a result, one of the columns of fire shot straight up and burned the Undertaker not once, not twice, but thrice.
As you can see in this video, the Undertaker literally gets engulfed in flames for a moment, before walking down to the ring faster than he ever has while portraying the Deadman.
As the match progressed, the referees had to douse the Undertaker in water several times throughout the match, and his entire torso looked like he was suffering from an extremely bad case of sunburn. But the fact remains that the Undertaker wrestled that match as if nothing happened is a testament to both his dedication and professionalism as a wrestler.
Meanwhile, the pyrotechnics guy responsible for this incident has not been heard of since.