Adult Swim's April Fools' Day History, Explained

Who doesn't love a good April Fools' Day prank? The only holiday solely devoted to gags, jokes, and pranks can be a fun way to embrace our silly sides. Aside from the yearly showings of pranks that go way too far, April Fools' as a whole is a fun, lighthearted celebration. Adult Swim agrees, and they've held an annual April Fools' Day prank on air every Apr. 1 since 2004. Obviously, the exact nature of the joke is not revealed ahead of time, so audiences never quite know what they're in for. We've seen surprise early releases of episodes, creative edits to existing shows, and fake announcements of nonexistent events. It's a yearly staple that viewers have come to expect from Cartoon Network's late-night surrealist comedy block.