What are some great national April Fools jokes or ones played to a large audience? To me one of the best happened years ago. Remember when Adult Swim showed Big O Well i bet that sparked a memory in some people.. But if you didn't see it back then here is how the joke went down.. They are scheduled to show the series finale. The AS text comes up to enjoy the final episode.. episode starts.. and it is a repeat. People are pissed. Cut to a week later. The black message tag apologizes for the mistake. It tells viewers not to worry. They have fixed the problem and for us to enjoy the final episode...Fade to black.. and up comes.. The same episode they mistakenly aired the previous week. About 20 seconds play then it cuts to black and says "Just kidding! April Fools!" and then plays the real episode. So many people were pissed at that. Some stopped recording only to miss part of the episode. EDIT: Just found out that was not an April Fools joke. It was the same thing, but not an actual april fools day joke..