Is that actually Bert from Sesame Street in the background of photograph? What the heck do Bert and Bin Laden have in common?
The picture in the poster came off of the web, from a website titled 'Bert is Evil'. Apparently whoever made up the poster in the photo (which is real) went onto the web to get pictures of Osama, and found that one. Probably had no idea who Bert is.
Do a web search for 'Bert is Evil' and you should find it.
Re: Bert & Bin Laden:
There was once a website called "Bert is evil" which pictured Bert with nefarious figures in history à la Forrest Gump. One was Bert & Bin Laden -- after the embassy bombings in Africa. The Muslims, in trying to make a montage of Bin Laden pics, accidentally found that one. It was quite a laugh riot at the time.