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1.
When an athlete or a team wins so consistently (mainly in Motorsports, but is applicable in other sports as well) that it ruins it for everyone else and no one else wants to participate in it or watch it anymore because of the overwhelming predictability. Named after Michael Schumacher, whose 5 back-to-back Formula One Championships led to huge declines in ratings & race attendances.
#1. Nascar's ratings are going down the drain because of Jimmie Johnson's full blown Schumacher Effect.

#2. Valentino Rossi & Sebastian Loeb have spawned their own mini Schumacher Effects in MotoGP and the WRC, respectively.
by reditalia593 March 21, 2010
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