The one that Adam Sandler sings on the Wedding Singer (Somebody Kill me Please). Makes you want to laugh and cry at the same time.
On a more serious note, though, I reckon Adele's 'Someone like you' is a real heart-wrencher.
I was listening to Go your own way last night. I absolutely love this song. ABBA's Knowing me, knowing you is another good one and so is What's love got to do with it..Ooo, and Gotye's Somebody that I used to know.
The whole Sinead O'Connor Faith and Courage album! I used it exclusively for one breakup. Especially memorable - No Man's Woman (It don't make me happy this mantrolling Thing that you got for me) - don't you love it?!
and Jealous (You're jealous, you just can't stand to see me get along / Without you - like I do... you told me to / Now you're jealous)....
You can really get it all out with Sinead!
Plus gentlemen - I certainly do not mean all of you....... :) Its for specific situations and surely guys could sing womantrolling and No Woman's Man to that song!!!!!