Don't take jokes seriously. In fact, don't take anything seriously. You miss the point if you start taking things seriously. Even scriptures have to be taken non-seriously; only then can you understand. Understanding has to be with a deep, relaxed, non-serious, playful attitude. When you become serious you become tense. When you become serious you become closed. When you are playful many things can happen because in playfulness is creativity. In playfulness you can innovate.