For anti-kettle tactics, I refer you to a children's book(!) about Edith Garrud:

One day, Edith took part in a big protest march to the House of Commons. The police were trying to disperse it and one policeman said to her, "Now then, move on, you can't start causing an obstruction here."
"Excuse me, but it's you who are causing the obstruction," she replied, and then she pretended to drop her handkerchief. As she stooped to pick it up she got underneath him and threw him over her shoulder. He hit the ground with a thump and Edith escaped into the crowd before the bobby could recover his wits.

Not to advocate violence against police -- but if you're going to do it, flinging coppers over your shoulder has a lot more style than throwing bottles at them!