Talk:Cartman Joins NAMBLA/Trivia/@comment-3466346-20180404210539

It's most likely that the hall gag is specifically referencing Scooby Doo but it has appeared in media before thta, first appearing in film in the '30s. It has no specific name so it's probably best left as is but TV tropes has a page for it

http://tvtropes.org/pmwiki/pmwiki.php/Main/ScoobyDoobyDoors