Did you know that Block Island has a custom that says "No Hats Allowed Behind the Bar?" You might notice that whenever a restaurant worker walks behind a bar, he/she always removes his/her hat. You'll see this done when some one comes out of the kitchen with a baseball hat on and goes behind the bar.
If anyone walks behind a Bar on Block Island with a hat on, he must buy a round for the entire bar.
I do not know how this originated but ask any bartender and they will tell you that it's true.