• A carrot or a stick? Nope, a free lollipop!

At the BBC again : 

Lollipops given out free to party-goers as they left the pubs and clubs have helped reduce crime in December in a Buckinghamshire town, police believe.  Research suggests people leaving pubs and clubs after drinking alcohol are often aggressive because their blood sugar levels are low.

Well, the science may well be right (as a diabetic I know that alcohol lowers your blood sugar, though it also blocks seratonin receptors which reduces the feeling of wellbeing so might also explain it a bit), but presumably a real carrot would work just as well!