I agree that Phillip is a total goof and he must be so bored to be getting his kicks by making stupid remarks and getting away with it. He's basically the Queen's toy boy (official name is consort) and looks like he finds everything so very amusing. My guess is that they snicker and poke fun at everyone, that's why they're always giggling together, him and the Queen. (just an impression - apologies royalists). Camilla seems to be smiling a lot too, happy as a clam to have finally reeled in her man.