JSoup said:
Sad to say, this doesn't surprise me. If there is any one thing hardcore zombie-walk fans don't understand, it's "I'm not playing, leave me alone please."
I worked a traffic escort detail for a zombie walk downtown last year. One stretch of it went up a major thoroughfare. The crowd was supposed to stay on the sidewalk, but didn't (in fairness, the event was bigger than anticipated and they probably wouldn't all have fit). There were a number of participants running up on people's cars while they were stuck in traffic, clawing at the windshields, and even leaning or reaching in open car windows.
It's a minor miracle none of those idiots got shot.