Well, Fun Stuff is a board, while What Made You Laugh is a thread. You're not really breaking any hard rules by posting this as a separate thread, but we do have several long-running, well frequented, generic threads in the Fun Stuff board, so that the board doesn't get drowned (when the traffic picks up, ehm) in a ton of threads that are unlikely to have more than just a couple of replies.
There's What Made You Laugh/Sad/Astonished, Yarn of Insignifcant Questions, What's On Your Mind and Random Media or The More You Know.