I rarely go to the supermarket - my wife loves to do the shopping.
I may pop in to one to pick up an item or two occasionally.
About a month ago, we were going out to eat and decide to stop in the store on the way home. [Here we have a major chain callled Krogers.] As we were checking out, some really old, dumpy codger [way beyond my level of the same] was blocking the end of the check out line gabbing with a friend.
I quietly tried to ease myself out of the lane so I could load our cart. I accidently moved his cart with my hip and leg. He swings around and says, "Are you trying to be smart?" I replied, "But, sir, I already am smart!" Then he says, "Okay, buddy, do you want to take this out to the parking lot?"
I was so amazed at this escalation, I was speechless and just chuckled. I think he could have been decked by just about anyone, old ladies and little kids included. By then he started to move off yelling other things. Maybe he was hoping to get his wife some life insurance or sue someone.
My wife does not want me to go to the store with her any more!

Now we are both on the lookout for him in other places.