Nirvana’s Smells Like Teen Spirit vs Rick Astley’s Never Gonna Give You Up is a travesty of a mashup that should never have happened. And yet it did. As Rick Astley does his weaselly little jig for what seems like eternity, promising never to give up torturing our souls, Kurt Cobain gently weeps on his guitar, emerging only towards the end of the darkness to deliver guest vocals. Even more horrendous: the two songs actually go pretty well together. Pure blasphemy.