Happens to me pretty often, especially in non-English music. My mother, though, is the queen of this--she can't get a song lyric right to save her life.

By the way, there's actually a term for mishearing lyrics: mondegreen. It's derived from some woman who heard a verse "and killed so-and-so and laid him on the green" as "and killed so-and-so and Lady Mondegreen" and went on to publish collections of famous mondegreens, a term she coined. Things like the infamous Numa Numa song lyrics and this video also count as mondegreens.