Something I just read (can’t tell you what without spoiling the puzzle) reminded of an old cartalk puzzle:
At an antique auction, one of the items that came up for sale was a child’s sled. It was a hand-made sled, a wooden sled that the auctioneer claimed was made by none other than George Washington himself.
The auctioneer turned the sled over and read the following inscription carved into one of the wooden slats:
G. Washington, September 10, 1752.
However, someone in the crowd stood up and said it’s a fake. How did that person know?