I seem to have undergone half a lost weekend, so I hope you'll forgive this late entry, as it were. As I understand it , the Wainwright/McGarrigle (sp?) household never really recovered its equilibrium after this offering, and it may well have precipitated young Rufus's burgeoning career as a gay icon. I give you "Rufus is a Tit Man".
Edit: I'd also like to nominate Bohemian Rhapsody by Queen - they might not have regretted it , but I bloody well do!