Nirvana

At the 1992 MTV Video Music Awards Nirvana performed "Lithium." Guns N' Roses were to perform later in the show with Elton John. Two pianos were set up for the performance, one for GNR lead singer Axl Rose & the other for Elton John. When Kurt was walking off stage he spit on the keys of the piano he believed to be Axl's. Kurt later found out that the piano he spit on was actually the one that was used by Elton John