1 Hitler's Brain: When we win die war, we will export our superior Nazi culture to die entire world!
2 Hitler's Brain: Everyone will eat die traditional German foods named for their places of origin!
3 Hitler's Brain: Ja, die whole world will soon be eating die Hamburgers und die Frankfurters!
4 Monty: You fiend!!

Interestingly, the sausage known in the US as a frankfurter is known as a frankfurt in Australia.

I've also just discovered that, at least according to Wikipedia, a hot dog is, in the US, apparently, just the sausage. The article says that:

A hot dog (frankfurter, wiener) is a moist sausage of soft, even texture and flavor [...]. Hot dogs are most often served hot in hot dog buns.

Well, you learn something every day! The usage I'm familiar with is that "hot dog" refers to the combination of the sausage in the bun - the sausage by itself is not a "hot dog", but rather a frankfurt. I believe that's the common usage here in Australia.

In fact, I'm genuinely surprised that anyone refers to the sausage alone as a "hot dog", and that a hot dog is served in a bun. To my mind that's analogous to saying that a slice of cheese is a "sandwich", and that a "sandwich" is generally served between two slices of bread.

I'm familiar with many common American usages, but this one just took me by surprise. I'm amazed I'd never noticed it before.

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UPDATE: Whew! This one generated a mountain of e-mail. Thanks to all who wrote. The brief summary is:

• In some American usage, "hot dog" can refer equally to either the sausage alone, or to the construction of sausage-inna-bun. The difference is mainly by context: if you go to the supermarket to buy "hot dogs", you're buying the sausages (and possibly a pack of buns to go with them); if you buy a "hot dog" off a street vendor, you'd be surprised if you got just the sausage and no bun.
• In some American usage, a "hot dog" is usually a sausage-inna-bun, but it can also sometimes refer just to the sausage if the context is clear.
• Apparently most people in America don't call them frankfurters at all - they're wieners.
• Wikipedia is wrong, wrong, wrong, I tell you!!!
• In Frankfurt, they call them wieners (after Wien, or Vienna). In Vienna, however, they call them frankfurters. The fact that neither city wants to claim credit for them might tell you something.
• The situation is actually completely analogous to hamburger, which in American usage can refer either to the construction of a patty of ground meat assembled with other ingredients and condiments on a bun, or just to the meat itself. The analogy extends even further, because in Australian usage hamburger always means the former and never the latter. The meat alone is a "meat patty" or "minced beef" or somesuch, but never "hamburger". The odd thing was that I knew this difference between Australian and American usage for hamburger, but was taken by surprise over hot dog, which I'd always assumed (until recently) necessarily implied a sausage-inna-bun in both forms of English. Strange how I knew one and not the other.

UPDATE 2: Now with the Europeans waking up, there are more floods of e-mail! More fun facts you never suspected:

• Actually, wieners and frankfurters are different! Wieners are made of pork and beef, whereas frankfurters consist of pork only. (At least in Germany.)
• In Germany a "hot dog" refers not merely to a frankfurter/wiener on a bun, but it must also include ketchup, Danish remoulade, yellow mustard, fried onions, and pickle slices!
• Don't believe anything those Americans tell you about sauerkraut being authentically German - it was their idea to put that on a hot dog.
• The less said about chili the better.
• And just don't ask about the different types of cabbage!