To touch on Barto's question, I simply step back and let the other animals sort out who goes to the new open line... no need for fisticuffs if I'm just buying ice cream. Though if I'm buying chips or kale (or kale chips) you better get the ---- out of my way.

Kale man... Kale. It will change your life. Perhaps TAC could rub a few leaves on that groin to reduce the swelling.
And being inspired by TAC, I'll make sure that I go one-up on his move the next time I'm at the market. Zip ties baby... this thread may morph into the old Denis Leary bit. Which one of us is the world's biggest a$$hole?
I use shopping carts, and I leave them around
I'd take them with me and leave them all over town
I'm an asshooole~
It's their job, not mine, so I don't put them back
I tell stores to blow me and pick up my slack!
I'm an asshooole~

Parodying Denis Leary's song, just having fun, it's not mean-spirited...