Haven't seen that many of the "misunderstood" songs except for one....
"Crash into Me" by DMB...it's a song about a peeping tom - so unless that is how you met (eww) probably not a good choice. If you really listen to the lyrics you'll realize that you don't want grandma hearing that (sample lyric:
Oh, I watch you there
Through the window
And I stare at you
You wear nothing, but you
Wear it so well AND
hike up your skirt a little more, show your world to me
Also, no one has mentioned this but The Police's "Every Breath You take" is another rather dark song that is often used...but the song has really a rather scary possesive/stalker vibe to it.
Just make sure whatever song you pick that the lyrics really say what you want.