Time Well Spent
Early in a game of Civ V, Alexander took Petra from me at the last second, so I built a special city in the frozen wastes, blocked it in with my own cities, gifted it to him, then burned the rest of his empire to the ground. It took about five hours. I like to think he learned his lesson, but that forward-settling jerk still looks as smug as ever.
Story credit: Reddit / Portarossa