Boober Fraggle, on the run from the silliness of Joke Day. Joke Day is a Fraggle holiday celebrated in the Fraggle Rock episode "Boober and the Glob." Everybody has to dress up in silly costumes and tell jokes all day on Joke Day. The celebrations include the Traditional Medley of Knock-Knock Jokes. Retrieved from "https://muppet.fandom.com/wiki/Joke_Day?oldid=1093338" Categories: Fraggle Rock Culture Fictional Holidays Community content is available under CC-BY-SA unless otherwise noted.