They are both taking a piss at the urinal. Both men finish at the same time. The man in the navy goes to the sink, and the marine heads to the bathroom exit. The navy man speaks up to the marine and says "you know, in the navy they teach us to wash our hands after taking a piss." The marine stops at the exit, and responds "oh yeah? Well in the marines they teach us to not piss on our hands."
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