#2 The Undertaker gets burned for real
The Undertaker has long been known for his toughness and commitment to WWE, no matter how much pain he might be in. Stories have been told of him working with taped ribs, wrestling in long matches after getting his stomach pumped, and even climbing up a cell with a broken ankle.
But the key in all of these things is that ‘Taker kept these injuries concealed. He couldn’t do the same when he got set on fire for real, though.
At the 2010 Elimination Chamber PPV, the pyrotechnician responsible for the flame columns that were part of his entrance mistimed the flames, resulting in the Undertaker getting engulfed in flames not once, not twice, but three times in quick succession.
So what does the Undertaker do? He simply jolts forward and no-sells fire. He climbs into his pod as planned, stays in there for a long time as planned (though not without dousing himself in water to ease the pain), wrestles the match as planned, and even ends up in the Walls of Jericho with his burnt torso being pressed against the ring canvas as planned. All as if suffering second degree burns never happened at all.
So if there was ever any wonder why there is such widespread respect and reverence for the Undertaker, this is a very good reason.