It’s a reference to a reddit user who would post these intricate comments with these really engaging stories that would then end with that last paragraph, which describes the events of a 1998 wrestling show where the wrestler The Undertaker threw the wrestler Mankind (https://en.m.wikipedia.org/wiki/Mankind_vs._The_Undertaker) and the type of wrestling match (https://en.m.wikipedia.org/wiki/Hell_in_a_Cell ).