Reason 4,792,340 why Milan bugs me

People here hold their place in line at the grocery store with their baskets or carts. I don't mean "oops, i forgot something, i'm leaving my cart here and running over there for a sec." I mean they do half of their shopping, park the basket on the floor in a line and walk casually away to continue shopping, popping back to unload and scoot the basket up a bit. and if they're not there or not ready when it's their turn and you are behind them and even consider going ahead of them? they'll yell at you.