The Lawnmower Incident (Season Three, Episode Six: "Guy Walks Into an Advertising Agency")
I know what you're thinking: We took the richest, most subtle show on television and boiled it down to a bloody animated gif — one that doesn't even involve Don Draper? Yes, and here's why. First, Mad Men's violence is almost always of the emotional variety, so its single moment of genuine gore was genuinely shocking. Second, it's a perfect example of creator Matthew Weiner's masterfully unpredictable plotting: Introduce a brand-new status quo in the form of an English advertising wunderkind set to take over the office, then mow it down like a John Deere. Like all the best Mad Men moments, you can't see it coming.