There's a printable version here, although you may need to scale it to fit your printer. It has a message on the back: "Feeling guilty for laughing at this joke? Give money to Oxfam!" Which, like the card itself, will make a lot more sense to people in the UK who have seen the queues (and the cards) for Oxfam unwrapped donkeys and goats.
Also available: King Kong and Q the Winged Serpent.