When I go shopping for items such as food, I have been getting snookering looks because of how I position my shopping cart. I get in line and have the cart behind me. To illustrate what I mean, I would be paying and the cart is behind me. I like this and it works great for me because I like to yap with the cashiers. But today, I looked back and some lady was behind my cart. She could have reached her items over my cart and put them on the conveyor belt but she chose not to. She looked like she was angry at me, I just ignored her and ate some fig newtons. Am I breaking some unwritten rule here about cart placement?