I picked this oddball card up from the $0.50 bin at a card shop several months ago - it is a 2000 Upper Deck Black Diamond wrongback featuring Barry Bonds on the front and Jeromy Burnitz on the back.
Although interesting, I assume cards like this from the last 10-15 years are just common misprints - if a card like this was printed in 1990 instead of 2000, it might actually be worth something.
Well, everyone thinks Bonds is a bum and no one really has cared about these types of cards for a long time - maybe a die-hard player collector.