The great "worst song of all time" debate continues here, here, here and probably 3000 other places.
Apparently the official winner is "Mr. Roboto" by Styx. Really, it's not THAT bad. Certainly nothing reaching the cavernous lows of the vocodered-to-death Believe or the inadvisable attempts by the men to sing on ABBA's "Does Your Mother Know?"
And for sheer inappropriateness I stand by my earlier comment that "Sweat (A-La-La-Long)" by Inner Circle is the winner. Even as an 11/12 year old I thought there was something highly suspicious about those lyrics when everybody was singing them and it was on TV every five minutes.