Angus Young credits a bathroom break for a lyrics breakthrough for one of AC/DC's biggest songs. During an interview session for Essentials Radio on Apple Music 1, Angus said he and Malcolm Young were in a Miami studio's rehearsal room in 1979. All Angus had in mind was to start the song with the stripped down drums/guitar riff da-da-da - da-da-da, but he wanted to make sure the rest kicked in at the right time. Malcolm popped behind the kit and the two nailed down the timing. Then Angus headed to the toilet and while tending to business on the throne, came up with the lyrics for Highway to Hell.