I don't really have the "stomach" for hitting children, though I have intentionally tripped one or two "by accident".

I can tell you that the best way of dealing with obnoxious commuters at the Port Authority Bus Terminal is to quickly but gently tap their right heel with the outside of your left foot while they're "speed" walking so that it upsets their "gate" and catches on their left leg.

They trip ever so ungracefully.

I learned to do this in Junior High, and it's just such a marvelous aggression release when well executed.

The only issue is that you can/will take out a couple of "innocent bystanders" who are walking near the guy when he abruptly spills to the floor during a crowded rush hour.