(From Cat Legends)
The Prophet Mohammed, the founder of the Moslem religion, believed dogs were unclean, but loved cats so much that he once cut the sleeve from his robe to avoid disturbing his cat which had gone to sleep in his arms. According to legend, the “M” marking on the forehead of the tabby cat was created by the Prophet Mohammed when he rested his hand on the brow of his favorite cat.
Me: Why don't you ever touch me like that?
MB: Because you're not a cat.
ETA: That is Mr. Jones with MB.