You should plug your cabinet into the last one and see what happnes. You'll probably just hear this voice come out like, "**** you... I'm the most insane sound ever"
John was looking for a loud/rude tone when he just plugged straight into the board overdriving the mic preamp...he found it! FWIW...Kurt Cobain did the same thing years later on the Nevermind track "Territorial Pissings".