I have just received an email from an online shop, and (as always) it's their proper, biggest, ever, really, this, time, sale.

So when I get to their site, I want to see all of their discounted Xbox 360 games.

Which one do I click?

As a customer, do I care about the difference between "All Special Offers" and "On Sale"?  Come to think of it, why are "Fast Dispatch" or "Game Highlights" even in the "Special Offer" section?

I have no idea. No idea at all.

If you are in charge of big sites, be careful that your navigation menus don't turn feral.  Make sure you take some time now and again to review your content, where it lives, its labels and how the user finds what they are after.