Maybe he wanted them to pass the popcorn..Just joking.I have seen dogs pee on there owners when they had to go out to relieve themselves and the warning and asking from the dog was put on hold for a bit.I don't know if this is what happened in this case that's just the few case scenarios I have seen.
Might want to make a trip to the vet's office for a physical check up first and foremost.
My parents 2 year old female lab has a problem controling herself and recently was curling up, relaxed and calm with my dad in a chair and peed all over him. They're now working closely with their vet to identify and treat potential physical causes, such as weak bladder control and the like.
Is the dog neutered?
I was LOL ing myself when I first read it.