Lol, I hope this doesn't violate any profanity rules here, but it is "epic lulzy."
William Hung, the wannabe Asian-American Idol (in)famous for his rendition of Ricky Martin's "She Bangs," once sang "Take Me Out to the Ballgame" at a Chicago Cubs game. Now, the Cubs' 7th-inning stretch has made a tradition out of horrible singers (*ahem* Ozzy
*ahem*), but IMHO nothing tops Hung's version...while he was "hung" over:
"Buy me some penis
and Cracker Jack."
Sorry, no sale, but there are plenty of ballpark wieners from what I understand.
"Everybody Plays the Fool" is from the '60s, not the '80s, although FWIW there could've been a re-release then. Useless trivia: The lead singer is Cuba Gooding Sr., of the band Main Ingredient. He, of course, is the father of actor Cuba Gooding Jr.
Useless trivia 2: @Nathan
Phoebe sang "Hold Me Closer, Tony Danza" on an episode of Friends.
EDIT 2: I didn't see that someone had beat me to it with the Mondegreen definition.
Even useless-er trivia: I'm writing a story myself in which one of the supporting characters is profoundly deaf in both ears, and had cochlear implants as a child. Problem is, the surgeon put them in upside down, and as a result he hears a lot of things incorrectly or backwards -- like song lyrics. And he was once part of a folk-rock band called Mondegreen. (It's kind of a play on how people used to think there were hidden messages in rock songs but you had to play the record backwards.)
Is it revealing any trade secrets if I include some of his that he hears wrong?
EDIT 3: I just couldn't wait. Some of these I actually know people who sing them, while others I just kind of came up with on my own:
"It's Morgan Freeman!" Boston, "More Than a Feeling"
"I want a piece of Danish!" The Ramones, "I Wanna Be Sedated"
"Some weirdo gonna break it / Lock the cash box, Lock the cash box." The Clash, "Rock the Casbah"
(The other line goes "Sharif don't like it" but I've also heard people say "Shari'a don't like it," referring to the controversial Muslim doctrine of Shari'a law)
"Olly oxen free, Take a Chance on Me..." ABBA, "Take a Chance on Me"
("honey, I'm still free")
"Hold on, Lucy, don't let go..." .38 Special, "Hold On Loosely"
"Hey, ol' Snoopy, Snoopy hello..." The McCoys, "Hang On, Sloopy"
"Iraqi Hot Potatoes" Falco, "Rock Me Amadeus"
"Eee my God it's Danny DeVito" and "I'm the goddess of Good and Evil" Iron Butterfly, "In-a-Gadda-Da-Vida"
(A word about that last one: The lead singer's intended words were "in the garden of Eden," but he was actually too high to pronounce them correctly on stage!)
"She's got pretty dangerous eyes" Kim Carnes, "Bette Davis Eyes"
"Amstel Light, Amstel Light" Metallica, "Enter Sandman"
("exit light, enter night")
"I can see a pair of dice by the dashboard light!" Meat Loaf, "Paradise By The Dashboard Light"
Of course, nothing tops Al Yankovic's version of Nirvana's "Smells Like Teen Spirit," called "Sounds Like Nirvana" or something like that. He basically mumbles a bunch of incoherent words all the way through (like Cobain did in the real one), and the video even has Weird Al "losing his marbles" (spitting them up) while singing "got all these marbles in my mouth."
<-Mr. Mondegreen approves.