User blog comment:UnboundIsaac/What?!/@comment-6218837-20150429152534

Never had a frustrating glitch happen to me in 350+ hours of Terraria. PC master race. But I can tell you about this amazing glitch I had happen a short while ago, while livestreaming yesterday.

So I went to the Dungeon, even though the Old Man wasn't there (I had already summoned Skeletron that night) and as soon as my gut felt it, hit the Magic Mirror. I was struck by a Dungeon Guardian in the middle of teleporting and escaped with 100/500 health. Wasn't wearing Beetle, to clarify.