Warm water plus a teaspoon of apple cider vinegar is supposedly a cure for hiccups.

More cures include currant jelly under the tongue, one teaspoon white sugar, drinking water while bent over at the opposite end of the glass, peanut butter, salt, plug the ears while drinking water, pulling on the tongue, eat crushed ice, breath into a paper bag, and bitting into lemon wedge + angostura bitters.