So bad
You’re gonna have Kurt Cobain askin’
To autograph a bloodstained napkin

from Eminem – Untitled Lyrics on Rap Genius

Meaning

In other words, he’ll kill you (and you can finally meet Kurt Cobain — dead lead singer of Nirvana — in Heaven!). The line stands out because Cobain died of a self-inflicted gunshot wound to the head, thus one’s brains would have to be “bashed in” pretty badly to compare

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