YOU BETTER BE GOOD
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It came from the Christmas song "Santa Claus Is Coming To Town" as covered by Bruce Springsteen. When he sings, "YOU BETTER BE GOOD FOR GOODNESS SAKE," it sounds scary and threatening. Two friends on were known to jokingly threaten each other by singing this, and then send each other their self-made lols on facebook. Friends caught on, and a meme was born.