What do these these images have in common?
The answer is: Michael Leunig and Evil Bert. The first picture comes from a recent Motoons protest in NYC, the second from a 2001 demonstration in Bangladesh supporting the Taliban. Some trickster submitted one of Leunig's cartoons to the Iranian newspaper's anti-semitic cartoon contest; evidently a quick websearch led the protesters to connect him to the Danish cartoons because, well, he is a cartoonist. What makes this funny is that Leunig is a sensitive supporter of the Islamists. Something similar happened with the Evil Bert poster: someone in Bangladesh went looking for Osama images to put on the banners and up popped Bert. So it goes in a world where the internet puts the raw materials at everyone's fingertips but where actual knowlege is sometimes in short supply.
The best response to all this is laughter and ridicule. Yeah, I'm cruel that way.