I have no idea what is going on here

One of the all time great pictures. What the heck is Tom pointing at? And what the heck is Becca doing? Going crazy. Is she dancing with Irwin? Hard to tell. Just to let people know, I don't think I've ever seen Tom, Irwin, and Becca in the same place before at the same time. I'm sure they have been; I just haven't seen it. Which makes this picture even more mysterious.