An oldie but goodie. A squid and a jarhead are side-by-side at two urinals in the mens room. They zip up at the same time and as the squid moves toward the sink, the jarhead moves toward the exit. Then the squid says, "in the Navy, they teach us to wash our hands after using the latrine." And then the jarhead says, "oh yeah, well in the Marines they teach us not to piss on ourselves!"