This is probably the best way to deal with 2012-enthusiasts. The world (probably) won't end in 2012, so get over it. And also, a hell of a lot of stuff that happens in the film is so scientifically bad, that it's hardly worth bothering with.
i did this to my class. i said, "ahem." "the world will end, and you wont live unless you wear this shirt!" and even the teacher took one. goes to show ya how dumb the world is.
That's....probably something only I would do.
If I'd have thought of that, I'd have done it. :D