Cuphead was released in 2017 by Studio MDHR as a run and gun game built around difficult boss fights and hand-drawn animation inspired by 1930s cartoons. Defeating a boss triggers its famous knockout screen, borrowed from boxing and early animation, marking the end of a stage players may have retried dozens of times. Clips of that moment spread through gameplay videos, streams and meme edits, and the short sting became shorthand online for finishing a hard fight or delivering a final blow.