Massage the upper, back part of the roof of your mouth. It may sound strange, but I got this one from my doctor. It stimulates the wandering nerve, which will subdue diaphragm spasms and get rid of hiccups for most people. He advised using a cotton-tipped applicator (he actually said Q-tip, but I 'm no corporate stooge). Sensitive gag reflex? Try pulling on your tongue, as this also stimulates the pneumogastric.