John Patrick “Jack” Douglass (born June 30, 1988), known online as Jacksfilms, is an American YouTuber, comedian, and musician from Columbia, Maryland. He launched his YouTube channel in 2006, building an audience through sketches, musical comedy, and parodies of advertisements, technology, and internet culture. His best-known series include Your Grammar Sucks, which turns poorly written online comments into comedy; JackAsk, his humorous take on audience Q&As; and Yesterday I Asked You (YIAY), which showcases viewers’ creative responses to questions and challenges. His style combines sarcasm, self-deprecation, wordplay, and absurd humour. Audience participation is central to his work, with viewers supplying jokes, artwork, and ideas that become part of the entertainment.