>>Same as "You can't have your cake and eat it too", should more sensibly be "You can't eat your cake and have it too".
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>Depends on the current meaning of "have". When someone says "here, have a cake", are you supposed to just have it (keep it as a posession) or eat it? Or, what does "I had a cake" mean - "...but I lost it" or "I ate a cake"?

As far as I can figure out, the only way you can eat your cake is to have it. Therefor, "you can't have your cake and eat it too" makes no sense to me. How the heck else am I supposed to eat except by having it. On the other hand, "you can't eat your cake and have it too" makes perfect sense, unless you are the kind of person who will never defecate, in which case, I suppose you can eat it and have it too.