Having fun.
I have just returned home from visiting Iceland, (the frozen food store, for our American cousins).
When I got to the checkout and started loading my groceries on the belt, the cashier whipped through them faster than I could load them, leaving them to pile up in the packing area.
So I had to sort through and pack this enormous pile of groceries in a space simply not big enough.
I decided to get my own back on this cheeky mare and started, slowly mind, to pack my shopping away. When the Mare huffed and puffed at being kept waiting, I packed even more slowly.
The Mare finally got the message when after making snide remarks to the next customer, I packed even more slowly.
When I finally got done she told me the price and I started patting all my pockets looking for my wallet. Her look of exasperation made me pat all the more.
So, after I eventually paid, I smiled sweetly at her and said, "Who was it said that pensioners never have fun".