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-The gang throws Barney a bachelor party. Barney's Bro-mitzvah ends up being one disappointment after another. Quinn returns, Barney loses big at the casino, and Robin calls off the wedding. Not even, did the right Karate Kid show up. The joke is on Barney in the end as it turns out the entire night was an elaborate prank, orchestrated by Robin. She did end the night with a great twist as Barney got to meet one of his cinematic heroes.