#2: The Championship Scramble Match
This match concept isn't a particularly old one, but it didn't have a long life due to people finding it overly complicated.
The Championship Scramble would start with two wrestlers and have another join every five minutes. There could be as many pinfalls or submissions throughout, and whoever had the last at the end of the time limit would walk out as champion.
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This meant that there could be several different champions within one match, with everyone scrambling to stop pinfalls and get their own. Matches could quickly turn wild, as bouts would evolve from a singles contest to a triple threat, to a fatal four-way and so on.
The stipulation certainly started strong, taking place three times on the same night at Unforgiven 2008, though the fourth and final match would happen at The Bash in 2009.
It's been over a decade since the Scramble match was last used, and with the recent success of the 24/7 Championship this year, it's clear that there is still a desire for short, exciting title reigns, which a Scramble could provide.