I felt a tap on my shoulder. I turned around to a man holding a book that wasn't mine.
He asked, "How much is this book?"
"Oh, I don't know. I'm an author. I wrote these novels," I said, waving my arm to the small display in front of me.
"So, you don't know how much this book is?"
"Maybe you should ask that woman over there. She runs the booth."
A few moments later, a woman presents me with a stack of books--none of them mine--and hands me a credit card. She said, "I'd like to pay for these."
"Actually, the cashier is over there. I'm an author signing my novels."
The woman joins the line to the cashier.
A student approached my table and picks up one of my novels. Before I could say anything, he flops the book down and walks away.