Back when I was teaching history at the middle school level, the principal would come into my classroom and we would have a little fun.
When I was teaching a class called "History of the Old West," he would come into the room all excited about an artifact discovered which dated back to those days. He would tell the story of how many thousands he paid for it, but it was a treasure, so was worth the price he said.
It was usually lip balm which he has scuffed up to look very old. The pitch was that it once belonged to Sacagawea.
For the most part the kids bought it. He and I were decent actors. They were gullible little people.
They never seemed to resent our little charade, and doing things like that occasionally brightened everybody's day.