Horrible Song Covers

[Soviet Heavy]

What is the single worst cover of a good song you've ever heard? Every so often you find something so ear-rapingly bad that you have to declare it the worst. This thread is for those songs.

I dare you to listen to the whole thing without laughing.

 

[Sacman]

Avril Lavigne mutilation of System Of A Downs Chop Suey...

Miley Cyrus' raping of Nirvana's Smells Like Teen Spirit...

Hilary Duff's abomination that is her cover of The Who's My Generation...