Over its 10-season run, Friends had many running gags, however, it may have accidentally repeated a joke about Joey having an identical twin without even realizing it. At the end of Season 5, episode 24, “The One in Vegas: Part 2,” Joey desperately tries to convince a blackjack dealer to go into business with him after noticing that the two of them have the exact same hands. Joey refers to this phenomenon as having found his “identical hand twin.”
Given how long the show went on for, it was
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