Via Eszter's Blog, a link to the wonderful and funny Understanding art for geeks – a photoset on Flickr.
You need to know some HTML and spend too much time online to get all the jokes, but even without many will be funny. Half a dozen made me laugh out loud and most made me smile. (Warning: One or two were in bad taste.)
Here's a sample, a Wikipediaficiation of Cristiano Banti's, Galileo facing the Roman Inquisition (1857):
Since you picked this particular image to showcase, I can’t help but mention this project concerning “citation needed” stickers.:-)