More than 20 years after it first hit the airwaves, Alanis Morissette's "You Oughta Know" is still one of our favorite songs from the '90s.Not only is it a staple of our "breakup song" playlists to this day, the hit also marked a major turning point in the singer's career. "You Oughta Know," like the rest of the album Jagged Little Pill, transitioned Morissette from pop music to alternative rock.Morissette in 1995.USA TodayBut the real lasting legacy of the tune is the mystery surrounding it. There's no denying that the song is an angry ode to an