Where do Hiccups come from?

Last night on the way home from picking up Alanna from daycare, she got the hiccups. She proceeded to tell us that she needed to get home to look in the mirror. I asked her why and she explained that she needed to look in her mouth in the mirror. Again, I followed this up with a why honey? She told me that because she had hiccups, she needed to look in her mouth to see the frog that was there.

Now, before I thought it through, I explained that there wasn't a frog in her mouth and that hiccups don't come from frogs. This then immediately was followed by her asking...well where do hiccups come from?

Awwww....shit. I hadn't really considered that I'd have to try to explain to a 3 year old where hiccups come from. I should have stuck with frog in the mouth--that one's easier ;)

Jeb piped up that hiccups are an involuntary reaction of your diaphragm..blah blah...to which Alanna looked unimpressed. So, the final verdict from Mommy was that hiccups happen when you get to laughing too hard.

I'm not sure I'm up for the next hard questions to come...