Like you, I have been to several concerts and have seen some interesting things. I have never seen a musician throw liquid at the audience but the below clip shows an idiot throwing a beer at Angus Young. How Angus handles it is perfect. He humiliates the fan, gets him tossed, takes a bow, then continues playing. And all this is happening while his brother Malcolm keeps playing. Complete boss move. I love these guys if you couldn't tell.