What's funnier (or sadder) still is that people couldn't see it for the joke it is. I cannot take seriously anyone who jumps to denigrate the poster in such mean terms. Shows a certain ignorance and the 'reviewer' should be congratulated on flushing the eejits out.
I agree: it's quite witty (I also like the "How UPS Deliveries Work" video to which there's a link on the page).
On the other hand, it would be hard to underestimate some people's intelligence. I recently saw a review on Amazon of a battery. The reviewer gave it one star because, although it was exactly what he'd ordered and there was nothing wrong with it, it didn't fit the gadget he wanted to power.