Funnily enough, I was always told it was illegal to gamble in the Navy. Unless we were playing Tombola over the SRE*, Horse Racing on the flightdeck (all for "charidee" - not) or merely risking lives at war. Other than that - never. Unless there was a bookies nearby or the Grand National sweepstake or the sweepstake for several cans of beer if you got the Captains Defaulters/Warrant Reading punishment bang-on. The only other one that springs to mind is the Sweepstake on which excuse the weapons engineers would use when the sea wolf, sea dart, sea cat or any other missiles missed their target on a practice shoot. ("Out of date ordnance" usually won the day)
With regard films there was always the legendary flightdeck movie when in the tropics - projected onto the hangar door with the audio out of sync by 0.5 seconds or the other Naval tradition of asking all your messmates which film they wanted to watch & then putting a completely different one on the telly.
* Ship's Radio Equipment - our own radio station.