User blog comment:Jessa The Random Phinbella Fan/Phineaddicts and Ferbaholics Anonymous/@comment-844113-20100424173841

Whoa, I missed a lot. (My leg is not actually bleeding, by the way.)

So since I didn't tell you guys the story, here it is. I was in science class and we were doing a silent reading. We could sit wherever we wanted. So it's dead silent and all of a sudden, this guy's voice comes from the corner, "My leg is bleeding..." and then he went and sang a whole parody. My teacher couldn't shut him up.

tl;dr? In a nutshell, some kid in my science class was singing it.