I'd like to know what messages appear when somebody is cheating and VAC detects it. Do they appear in-game (for games which support VAC natively) or via Steam's game overlay (opened by pressing shift-tab)? Does the game immediately close to show the message? What happens on the screen of the banned player and the players on the same server throughout the whole process?
I couldn't find unmodified screenshots or detailed enough info on google. This post briefly lists the things that trigger a ban, but not how it notifies the user of detected cheating visually.