Regular Show - Season 2

Mordecai and Rigby spend a night at Carrey O'Key's Karaoke bar and sing live, but since they are so motivated by the audience, they accidentally begin trash-talking about Benson, Pops and Skips. Their speech is taped without their knowing and they are given a copy while the bar keeps a tape as a promo. The next morning, Mordecai and Rigby wake up and forget everything that happened.