After thinking about it, using a hose to siphon water out of, say, a fish tank, is practically the same thing as drinking any sort of beverage with a straw (particularly a bendy straw).
My question is: why is it that when we drink from a straw, it doesn't act the same way as siphoning does? Why doesn't the drink just keep flowing out of the straw once you start drinking it? Conceptually they seem like the same thing physically.
(The things that jump into your mind when you're trying to sleep...)