There's got to be tens of thousands of songs that would be in appropriate for a wedding... A few that come to mind...

The Bloodhound Gang - "You're Pretty When I'm Drunk"
Led Zeppelin - "Babe, I'm Gonna Leave You"
Eazy E - "I'd Rather F#@k You"
The Greg Kihn Band - "The Breakup Song"
Phil Collins - "Throwing It All Away"

Whaddya know, there's a pretty comprehensive list of breakup songs that you might not want to play at a wedding...