In public, about 7 years ago when I gradurated high school. Everyone had to sing the school song. In private. I do't recall. I don't really listen to music so I don't know the lyrics to any songs, beyond a few lines. As such, I'm more likely to hum to a song rather than sing it. If humming counts then I hummed to a song this afternoon.

When was the last time you bought a video game?