Do You Know How to Get the Barman's Attention?

Don't tap the coins on the surface, but do have a note in your hand. Make eye contact and raise your eyebrows or lift your chin to get their attention. If this is your second drink don't hold it too high up - that's rude. Have an empty glass of whatever you've had before so they can see how drunk you are. Don't be afraid to say 'I will come to you at the next opportunity' if needed.