A common game to play with people less "experienced" in the ways and wherefores of the Internet is to direct then to the aforementioned Time Cube website; the subject is then given a couple of minutes to scroll down through the first page (and, believe me, there is a lot of scrolling to do), and subsequently asked to determine whether the whole thing is a great practical joke.
Surprisingly, it seems pretty certain that this immense Time Cube theory is not a hoax; this has been demonstrated fairly conclusively (Gene Ray has been invited by students at a university to give a talk; they experienced it all in person - perhaps not so conclusive, you say, but bear with me on this one).
And I can report that, out of the few tens of people I have tried this test on, no more than a third correctly tell that it is genuine, so expertly and/or crazily has the website been written.