"Exodus.... Who ate all the People?"

The story:

This wasn't actually my mistake, but a friend of mine from summer camp. He'd been going to town, in a car full of hippies (himself not a hippie) listening to Mr.Bobby. When he sang out loud what he had always taken to be the proper lyrics, he was met with a car load of shocked hippies laughing their arses off at him. He was pretty red in the face upon their return, but we all had a good laugh and he was none the worse for wear in the end!