In traditional Cologne brewery bars where they serve the local light beer (in small glasses of 200 ml) the waiter replaces empty glasses with full ones without

In traditional Cologne brewery bars where they serve the local light beer (in small glasses of 200 ml) the waiter replaces empty glasses with full ones without asking. Unless you put the coaster on top. https://en.wikipedia.org/wiki/K%C3%B6lsch_(beer)#Serving https://en.wikipedia.org/wiki/K%C3%B6lsch_(beer)#Serving