Now, University of Chicago anatomist, Neil Shubin, has provided the world with an explanation in his book Your Inner Fish. As described in the Guardian:
Hiccups are triggered by electric signals generated in the brain stem. Amphibian brain stems emit similar signals, which control the regular motion of their gills. Our brain stems, inherited from amphibian ancestors, still spurt out odd signals producing hiccups that are, according to Shubin, essentially the same phenomenon as gill breathing.
This is atavism, or evolutionary throwback activity, at work. Luckily, you do eventually stop trying to breathe through your gills when it dawns on your brain that you are actually a modern human, not a prehistoric fish.
http://blog.wired.com/wiredscience/2008 … expla.html