There was a good UK news clip on BBC a few months ago where they blocked an M25 junction. Bloke got his full kit of bagpipes out of the car and blasted them at full pelt in the faces of the protestors. Then the police told him to stop ...

Also a picture - I don't think UK, maybe Germany? - a protestor glued his ear to the road. So the police cut out the bit of tarmac and arrested him still with it glued to his ear when they took the mugshot at the copshop. Presumably they didn't use a roadmender's pneumatic drill ....