Kurt Cobain's tumultuous relationship with Bikini Kill drummer Toby Vail inspired many of Nirvana's most emotional songs, including the "Smells Like Teen Spirit" b-side "Aneurysm." "Love you so much it makes me sick," he sings. "She keeps it pumpin' straight to my heart." Vail may have given Kurt an "aneurysm," but not long after this song came out he began dating Courtney Love. Despite appearing on no actual studio album, the song was a regular part of Nirvana's live show, and it's become a massive fan favorite.