To that one guest...seriously...you were a complete pain in my butt!
I hopped on to back up cashier, and the guest unloaded her cart, and proceeded to watch the bags pile up on the counter. She finally looked at me, and told me the milk could go in the child seat. So I handed her the milk. After staring at it for a few seconds, she finally took it from my hands. I finished ringing up her order, and she looked at her bags on the counter and said, "I need room to write my check." Umm...
So I smiled, and asked, "would you like some assistance putting the bags in your cart?"
Guest: No, I want the bags put in my cart.
Me (gritting my teeth): Would you like some help with that?
Guest: Put the stuff in my cart.
It took everything in me not to put the bag with her three bags of chips on the bottom.
I'd have been tempted to push her cart up to the counter, and then just shoved the guests bags so they all fell in the cart haphazardly.