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When someone can't help but start singing like a drunken bird in a loud restaurant.
I was walking to the store and suddenly started singing 'I Will Survive' at the top of my lungs.
My boss walked in during a meeting and I started belting out 'Livin' on a Prayer' like I was in a rock band.
I was eating a taco and the moment I took a bite, I started singing 'Bohemian Rhapsody' like I had no idea what was happening.