Angus Young playing "Thunderstruck"'s main riff with only one hand in the song's music video.
The fact that they managed to respond to Bon Scott's death with only the second best-selling album of all time, bested only by Michael Jackson's Thriller and only because of sales outside of the U.S., and that album rocked (Hells Bells comes to mind)
Making bagpipes sound cool with "It's a Long Way to the Top (If You Wanna Rock n' Roll)".
According to a friend, it's impossible to listen to the title track of Back in Black without feeling like a Badass.
