This one came to me one dark night a few years ago while walking home filled to the top with beer. And then hick, hick, the hiccups showed up. A spasm in my diapraghm produced that annoying, involuntary experience.
I stopped. I stood absolutely still. Then I started breathing slowly and focused all my attention on one point. In this case I think it was a stop-sign. I focused my eyes to just see the stop-sign. I tuned out the rest in my field of vision, I tuned out my friends that was asking what I was doing. Within a minute the hiccups went away.
During the last few years IÂ´ve probably tried this method about 15-20 times. ItÂ´s always worked, within one or a few minutes the hiccups are gone. I donÂ´t know why or how, but it works. Try it out and tell me how it worked for you.