The Gravity star showed off her rap skills on Britain's The Jonathan Ross Show when she spit a few lines from The Sugarhill Gang's 1979 hit Rapper's Delight.
Bullock, 49, explained that she learned the rap to impress a boy that she liked back in high school. "I was like, 'Next time I go to that dance, I'm going to know every word. I'm going to make sure he sees me lip-syncing it, and I'm going to catch his eye, and say the words. And he's going to like me. And sadly it worked."
Bullock's rap wasn't the only act of the night. The actress also joined Tom Hanks, 57, on the giant piano to reenact his performance in his 1988 movie Big.