This seems like it ought to be a joke, and although it sort of is, it may actually be real. Supposedly, the blurry trading card pictured above was made in 1966 by Topps employees who never intended for it to be sold. According to eBay seller clubhouse:
The holy grail of all BATMAN CARDS. A 1966 TOPPS Batman black cape BATMAN ON BAT THRONE. A family member use to work at the Topps printing plant in CT during the 1960s. That is where this card originated from. It appears some Topps employees were bored one day and made a card of Batman sitting on the toilet. This card was never released.
If Batman on the Bat Throne wasn’t enough to tempt you, keep in mind that the $3500 also includes three complete sets of cards from ’66. How could you possibly pass this up?