Wasn't "swarmed", but had a road-rage incident happen to me on Saturday on the way to class.
Was driving to school. Another driver had a yield sign, but tried to pass and got cut off by the car infront of him. He got angry, got behind me and started honking and flashing his lights. I drive on, exit, and he follows, still doing the honking. I call 911 and start telling the dispatcher what's going on.
Get up to a yield sign, and the car in front of me stops, so I stop. The driver gets out of his car, walks up to mine, and starts banging on my window yelling. I told the dispatcher his license plate, car model and make, and general description as I drive off. The dispatcher ask where I was at and I told her I'd be in a Chase bank parking lot in about 20 seconds-- she says there are a couple of police officers nearby.
I enter the parking lot and he follows. Suddenly, he turns to leave and gets back on the road to get on the highway, and I tell the dispatcher. She yelled to another dispatcher what was going on, who relayed it to the cops. At this time a cop car comes speeding around the corner and pulls him over. Another cop joins seconds later and they force him out and on the ground at gunpoint.
My face ---- ^_^
Not really a swarm, but same general idea. If you want a real "swarm" I have one from my EMT clinical time.