Smells Like Teen Spirit backwards used to be passed around as a Nirvana fake titled "Sorry Yesterday". I remember I recorded SLTS on a boombox with a toy guitar and ran it backwards and put it as "Sorry Yesterday" on my purevolume page (whoa, remember when people used that site?). Lemme see if I can find it...ah, found the SLTS I did. I'll just denoise it and run it backwards aaaannndd...
StevOK - Sorry Yesterday