"Butterfly" wasn't really that bad. No, it wasn't GOOD, but in spite of being some sort of white-guy hybrid-rap thing, it's never really offended my musical sensibilities the way offerings from Limp Bizkit or Greatest Band Of The Decade Linkin Park have. Given that it samples the Red Hot Chili Peppers before they became irretrievably awful, it can't be the worst thing in the world. Since this is specifically the worst songs to top the charts and not just a catch-all "shitty Top 40 songs" thread, I checked to see if "With Arms Wide Open," a contemporary of this song, made the #1. It did. There's at least one that's worse.
"Two Princes" is too vanilla to be the worst anything. I already had this general argument a few months ago with now-fellow administrator dubq, regarding the hits of Hootie and the Blowfish.
I don't remember "Superman" by Five For Fighting, but I remember the band being kinda agreeable and vanilla as well. Let's check. FAKE EDIT: Oh man, mea culpa. I remember this one. This is pretty bad. Faux-artsy overwrought crap that sounds like the bastard child of Dave Matthews and Train. Blarrrggh.
I was at a wedding last night and almost got roped into--as it were--dancing to "Cotton-Eyed Joe" by Rednex. The fact that almost every wedding reception ostensibly requires this song is probably the #2 reason that I'm never getting married, one spot ahead of "no girl worth marrying would marry me," incidentally.