US Marines vs Royal Marines
A US Marine and Royal Marine are enjoying a few beers together after a joint training exercise. Of course, nature calls and they both step into the bathroom to take a piss.
When they are finished, the Royal marine washes his hands and the US Marine doesn't.
As they belly up to the bar for their next beer, the Royal Marine says "In the Royal Marines they teach us to wash our hands after using the toilet".
The US Marine looks at him and says, "You can't get into the US Marines if can't take a leak without pissing on your hands".
“There is no worse tyranny than to force a man to pay for what he does not want merely because you think it would be good for him.” ― Robert A. Heinlein, The Moon is a Harsh Mistress