http://www.well.com/user/smalin/hiccup.htm
Purely mental cures (no tools, no physical activity, no assist
1) Think of all the bald men you can.
2) Tell yourself "I'm not going to hiccup again."
3) Don't do anything; just wait for the next hiccup.
4) Close your eyes and visualize a neon sign, like a movie marquee; see the word "THINK" blinking on and off; concentrate on the sign and make the word blink as fast as possible.
5) Imagine a neon blue colour, coming from between your eyes, (also known as the third or psyhic eye) and directing it down the centre of your chest to the xiphisternum and then washing calmly across the diaphragm, from one side to the next and back continuously.
Cures involving your breath (or respiratory tract)
1) Laugh.
2) Swallow air.
3) Hyperventilate.
4) Induce a cough or sneeze.
5) Relax and breathe from your diaphragm.
6) Inhale and exhale once a second for two minutes.