OK, now that was just plain old... fun.

A bit dated, sure. But it's very easy to see why it's become a classic; not only is it laugh-out-loud-in-public funny, but with some brilliant settings and character work too, all circling around a huckster character who'll sell people any get-rich-quick scheme or political/philosophical utopia with the same bravado. Almost as if there wasn't really a huge difference between appealing to Mammon or Lenin when it comes to getting people to think they're doing something for themselves while someone else profits. Huh.