"Poe's Law — Without a blatant indicator such as a smiley, it is impossible to tell the difference between religious Fundamentalism and a parody thereof."
I suggest an addition to this. "Without a blatant indicator, it is impossible to tell the difference between a comic strip and real life." What brings forward this suggestion? Well, the numerous real life actions inspired by the comic XKCD, and now changes to the (in?)famous CAPTCHA system at Yahoo and Hotmail which to me hints at the idea they are moving slowly towards this.
Source: Secure Computing.