Hiccups happen when your diaphragm gets out of sync with your breathing. Most of the effective methods force these to re-synchronise. Drinking water out of the BACK of the glass makes you bend over forwards, which temporarily halts your breathing and when you straighten up to swallow, you start breathing again in sync. Usually. Also you might like to slow down the rate of eating, as gulping air along with food can set off hiccups. As a survivor of a boarding school where food happened in a lions on the kill fashion, I learned to bolt food as fast as possible. This caused quite a few issues that I had to learn how to slow down eating to fix. Hiccups was only part of it.