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Ed, Edd, ‘n’ Eddy - Season 2, episode 22: Mirror, Mirror On The Ed.

The Eds are taking a walk when they stumble on to the cul-de-sac kids playing Truth or Dare. The Eds want to join, but all the kids quit, leaving the boys alone. They play by themselves and then Ed dares Eddy to be Edd, who dares Ed to be Eddy, who dares Edd to be Ed. They go around being each other, confusing Rolf and causing commotion.