Athletic Humor is like telling a joke with your body. Jokes are funny because they walk you down a familiar path and then dump you out somewhere totally unexpected.
You can do this with your physical movement or team movement on the field by letting everybody believe that you are going to do something and then at the last moment deliver something else. Set up a boring old story and deliver something unexpected.
Sleight of Hand is another way to look at Athletic Humor. Many of the tricks that are done with discs may look like magic, but actually are just simple slight of hand. Tricking the eye of the crowd and judges is also a fine display of Athletic Humor.