1) Run a PVC pipe through the middle of a barrel
2) Fill barrel with concrete.
3) Two protesters on either side join hands and cuff themselves together inside the PVC.
4) Every commuter of every race in Boston probably hates you now.
http://imgur.com/a/z8y7b
Eesh.The actions surprised police, snarled the commute for thousands, and forced the diversion of an ambulance rushing a car crash victim to a Boston hospital, State Police said.