I totally understand joining a family member in line, especially a child.
However, even if you have NO intention of getting an additional item, nobody else knows that! Heck, EVERYONE can say, "oh no, I'm not getting another one of those laptops, I'm just standing with my son/sister/mother/aunt/etc" and then get inside and you each grab the items.
Most of us have been the 'victims' of 'line hoppers' and I tell you, THAT is where a lot of the violence comes from. Now I will never hurt someone, or allow myself to be hurt just for the sake of a bargin price, but people get crazy this time of year. Add frigid weather, sleep deprevation and a need to use the bathroom and you have a recipie for madness...