I'm sure this has been done before and if it has then sorry but what are everyones favourite cover versions of songs?

I'll nominate - All Along The Watchtower by Jimi Hendrix
Needle And The Damage Done by The Bronx
Hit It And Quit It by The Icarus Line
Like I Love You by Dillinger Escape Plan
Hurt by Johnny Cash
Hallelujah by Jeff Buckley

To be honest those probably aren't the best they are just the only ones I can think of.