We have all witnessed rude behaviour at one time or another. Having worked in the retail environment for over 8 years, I have experienced it first-hand on many occasions. Thus, I can completely understand why French café; La Petite Syrah have implemented a clever payment system which encourages pleasant behaviour from their customers by charging rude customers extra.
Reports show that the system which started out as a joke has been met with a positive response, leading to a more relaxed atmosphere and in turn, more relaxed customers.
I think this is an ingenious idea, which could be applied to other businesses to deter rude and offensive behaviour.