How about... We encourage protesters to go into supermarkets, fill their trolleys go to the checkout, have them scan all the items. Then claim they forgot their wallets/purses, then leave. This is exactly analagous to a DDOS attack in my mind, but won't result in 10 years imprisonment. Also.. target dairy and frozen items, as the staff must return these to the selves within 30 minutes or they must be binned. I'd like to see them try to get away with throwing people who forget their wallet in the supermarket in jail, or the solutions they come up with to combat it, like checking every person for their wallet in the line to the check out.