First the British banned the guns. That didn't work out as well as they hoped, so they came after the knives. Still not good enough. It's time to for some "hat control:"

Pubs in Yorkshire have been ordered to ban people from wearing flat caps or other hats so troublemakers can be more easily recognised.
The Park Hotel in Wadsley, Sheffield, is the latest to be asked to impose the rule by senior police officers.
Mark Kelly, the landlord said: "Police asked us to ensure that everyone removes headgear.