8. "Welcome Home (Sanitarium)"
Metallica's second-ever ballad (after "Fade to Black") is this dark tale of a man trapped in a mental asylum that seems to be plotting a violent revolt. When Rivers Cuomo wrote Weezer's "Undone - The Sweater Song" the track must have been in his head. "It wasn't until years after I wrote it that I realized it's almost a complete rip-off of 'Sanitarium' by Metallica," Cuomo told Rolling Stone in 2009. "It just perfectly encapsulates Weezer to me — you're trying to be cool like Velvet Underground but your metal roots just pump through unconsciously."