The line comes from Dwight Schrute, the intense beet farmer and assistant to the regional manager played by Rainn Wilson in the American version of The Office, which ran on NBC from 2005 to 2013. Dwight frequently lectures his coworkers as if common sense were a survival skill, and this blunt warning became one of his signature put-downs. Clips of his most serious lines later circulated on meme pages and reaction videos, where this short quote stuck as a ready-made reply to any obviously foolish idea.