Prostitutes on SALE

One day while passing a nursing home I noticed six old ladies lying
naked on the grass. I thought this was a bit unusual but I continued
on my way to the store. On my return trip, I passed the same nursing
home with the same six old ladies laying on the lawn. This time my
curiosity got the best of me and I went inside to talk to the manager.
"Do you know there are six ladies laying naked on your front lawn?"
"Yes," he said. "They are retired prostitutes and they're having a
SALE!"