I get them constantly. In the hospital setting we would help patients get rid of them by

Taking in a deep breath, blowing it out, then taking 13 small sips of water from a glass. it will feel like you are running out of air, and by the time you hit 13 youre ready to gasp for some air. This resets the Carbon dioxide level in your body, and forces the diaphram to relax. Why 13? its just an easy number. If you can only make 12 or 11 then go for it. I have yet to see this one fail.

Hiccups are miserable creatures. Esp when you hiccup, burp, swallow. yick!