Behave like an adult!
I have a part time job working in retail, and honestly, one of my biggest pet peeves is adults behaving like children. Adults failing to throw their own garbage away, adults leaving carts just sitting out in the middle of the aisle or the parking lot after their done with them, adults taking frozen items like ice cream and leaving them on the regular shelves, adults complaining because someone "cut them" in line, or because the item costs 10 cents more than the price tag they saw.... Seriously?? These same people then turn around and go home and yell at their children for not throwing away their garbage, not putting away their clothes, and not sweating the small stuff. It's one thing for children to behave like that, it's a whole 'nother story when it's someone who is 40 years old and is both physically and mentally capable of behaving themselves!