The Sinister Mark edit meme is everywhere right now. It's that specific panel from Invincible where Mark has that cold, dead-eyed stare. People are using it to show a character or person going full villain mode.
The format is simple. You drop the image right when someone switches from being nice to being absolutely ruthless. It works perfectly for video game characters having a breaking point or a friend who suddenly gets way too competitive. The contrast is what makes it hit so hard.
