Mine: I was a Junior Officer (JO) on a Navy Submarine. One watchstation JOs commonly stand is Engineer Officer of the Watch (EOOW), which is the man in charge of the dozen-or-so sailors in the Engine Room (ER). The EOOW sits behind a desk in Maneuvering (the control room for a submarine’s Engine Room and Nuclear Power Plant) with 3 Nuclear-trained sailors in front of control panels.
Normally every hour, one ER watchstander, the Auxiliary Electrician Aft (AEA), goes around the entire ER logging various electrical readings. One of these readings is in Maneuvering- checking the Auxiliary Interior Communications (Aux IC) circuit- basically pulling a switch and making sure a bunch of lights come on (which demonstrates that the IC ckt is working blah blah blah). This switch is located essentially right behind where the EOOW sits- so the AEA has to stretch and reach around the EOOW to test it.
If the EOOW is bored (and most 6-hour watches involve a lot of boredom), he may initiate the Aux IC Challenge. The EOOW will slowly and dramatically stand up from the desk and glare at the AEA. The AEA will ostentatiously slam down his log-papers, freeing up his hands. In the AUX IC Challenge, the goal for the AEA is to get around the EOOW (in the cramped space of Maneuvering) and flip the switch to test the Aux IC Circuit. The goal for the EOOW is to physically eject the AEA from the Maneuvering space. All the advantage is to the AEA (typically a very junior Electrician’s Mate), because he just needs to get around the EOOW. The EOOW has to keep the AEA from getting around him while at the same time wedging open a heavy door, expelling the AEA, and closing the door.
The EOOW usually loses. But much fun is had by all.