High Flyer is the only known participant of all 4 versions of May Mayhem.
May Mayhem was an event(held in May of course) where 40 wrestlers would be thrusted onto the top of a three prong scaffolding and told to throw each other off of it until there was only one man left. The winner of this match is guaranteed a shot at the IWO World Heavyweight Championship
The event was dropped when the IWO returned as an independent promotion in 2003.
The May Mayhem match was only considered a main event during the 2000 version. Zombie vs. Titan, Joey Malone vs. Donnie Daze & Schitzo Tod vs. Nuke were the main events for the other shows, each match over the IWO World Heavyweight Championship