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Another one is "wavedashing" in Smash Melee. Not really a bug, but certainly strange behavior that became vital in competitive play.

so many exploits in that game.. so many days i'll never get back.. anyone down for a quickie?

Similarly "skiing" in the Tribes series was a glitch in the first game that eventually became the later games' signature maneuver.

Snaking in F-Zero GX or Mario Kart. Especially in the former, it makes the game even crazier than it already is.