This is hilarious. I have no idea where it originated, but I got it at The Lone Voice.
Do you suppose the Lego people have a sense of humor?
Update: Reader DC writes from the Netherlands to say that the Mohammed/Lego image was originally posted on a Dutch blog called Retecool.
However, I found many highly amusing Mohammed cartoons there. The sight gags were clear, but the jokes in Dutch were hard to make out.