Some goofy ones:
real: Pearl Jam:"Jeremy spoke in class today"
heard: "Jeremy smoked in class today"
real: Whitesnake:"I was born to walk alone"
heard: "I was born to wear cologne"
real: Eurythmics:"Sweet dreams are made of these"
heard: "Sweet dreams are made of cheese"
real: Everclear:"I am still living with your ghost"
heard: "I am still living with your goat" -sarah
real: "They pull my plug, the picture fades" ("go to hell" -megadeth)
heard: "They pull my butt, they pinch your face"
real: "Dope Sick Girl" (by rancid)
heard: Do-si-Do (like the square dance). I couldn't for the life of me figure out why they were saying it ... I finally looked at the name of the tune and was like, duh. -jennie
"a little verse from "Better Man" by Pearl Jam. I thought it said "She cries and she's a lesbian, can fine better ham." It turned out to be "She lied and said she still loved him, can't find a better man".. -arlie
real: "Papa's in the icebox lookin' for a can of ale" ("Jump, Jive, & Wail" - Brian Setzer Orchestra)
heard: "Papa's in the icebox lookin' for a can of ham" (hee, I'm an idiot) -mary
real: "I'm cold and I am shamed, lying naked on the floor" ("Torn" - Natalie Imbrulia)
heard: "Nicole and I are shamed, lying naked on the floor" -matt