Psychologists Michael Apter and Mizi Desselles propose that in order for anything to be perceived as funny, we must be in a playful state of mind. In this "para-telic" state, we can let go of any concerns (like the fear of appearing dumb because we're laughing at a stupid joke) and simply experience things "in the moment." So I don't know what gets you into the golden retriever mood, but you might want to prepare yourself for this one!