Boy does this question bring back some fun memories!
Many many many years ago we would get a gang together around 9 pm, all had long nets,flashlights, some bird boxes, and of course a case or two of beer. We would head out to a local bridge that we knew had pigeons roosting under it.
Then around midnight, when there was little to no traffic we would head to the bridge, shine the lights up into the rafters and start snagging birds as they flew. It was crazy, but effective. One night a policeman stopped to find out what the heck we were doing... once he found out, he just told us to be careful and left.
Today... I wouldn't try it! We would be arrested for some kind of animal cruelty. Ahhhh, the good old days!