(I work in a guitar shop that caters to vintage and collectible guitars. A man comes in with three guitars claiming they are all either rare or owned by famous musicians.)

Customer: “This guitar was owned by John Lennon and used on his last album!”

Me: “Which one?”

Customer: “The one he made in ’85.”

Me: “Lennon died before then. What else you got?”

Customer: “Well, this one was played by Elvis!”

(This seems almost plausible. The guitar is of a vintage that I knew could have been from that era.)

Me: “Well, let me run the serial number…” *I run the serial* “Sir, this guitar was made in 1987.”

Customer: “BUT ELVIS PLAYED IT!”

Me: “How did a dead man play it?”

Customer: “What? Elvis isn’t dead! I bought it from him in Las Vegas!”