This scene appeared in an episode in the late 90s.

Homer Simpson is on a boat and is wearing a snorkeling-like outfit. On this boat, there is a long cord. The camera follows that long cord that goes from one room in the boat, down a flight of stairs or two and it ends in a room. The cord is connected to a pinball machine (or an arcade cabinet) and Homer in said snorkeling outfit is playing the game instead of doing something important. What episode was this?