Narya linked to Sara's latest Cavalcade of Bad Nativities. Apparently she puts these up during the advent to Christmas, i.e., starting at the beginning of December. The month is young, so you'll have to check back throughout the month for more.
In the meantime, you can amuse yourself by beholding the many laughable, mockable nativity scenes available in 2004. Be sure to click through to pages 2 and 3 after enjoying page 1, and don't miss Sara's snarky titles and text.
I have no idea who Sara is, but I see that she also sells "wtfwjd?" t-shirts and merchandise.