Without stupid activity, life could become unacceptably boring. There were times when life was so uneventful, you could actually hear your toenails growing.
So we did nutty stuff. We spent hours thinking up stupid stuff to do. It was either that, or a trip to the loony bin. When you lived in the North Atlantic, the only circus that came to town was the one you created in your head. We had to manufacture any fun we had.
For example... Only boat sailors will think this is funny... Why? Because they did it. If any submariner tells you he never pulled this one... He's lying.
When you got some JG or fresh 'out of the cabbage patch' lieutenant standing the diving watch... You waited. You waited until he had trimmed the boat. Then by twos and threes, you made your way to the forward room... You waited some more. Then all of you moved by ones... Twos... Until all of you were in the after room. The boat would take on weird angles... The diving officer compensated... The trim manifold operator laughed as he responded to instructions...
"Pump 500 lbs. aft... No, forward... Wait... Make that after trim... Forward trim... Belay my last... Make that zero bubble! More dive on the stern planes... What the hell's going on? What's happening??? Boat's really acting weird..."
It never took long for the COB to get a handle on what was going on.