It's the 20th anniversary of Billy Ripken's (yes, Cal Ripken Jr's brother) infamous baseball card, number 616 issued by Fleer where Ripken posed with his batting practice bat with the end of the handle visible.
What ensued was absolute chaos and—as the "error" card's price rose to nearly $500—there were some amazing stories. A kid, who happened to be a fan of Ripken, had purchased a huge lot of No. 616's from a dealer for $50. When the curse was found, the new worth of the cards was closer to $20,000.
Today it's worth around $5. .
[Via]