One thing that getting crazy loud hiccups all my life has taught me is that random strangers LOVE to give you advice. Especially in malls or on busy streets but not confined to just those places. The last "this is my hiccup cure" run down I got was actually in a hotel from the porter taking our bags up the room as we checked in. His involved swallowing three times in a row and then holding your breath. A lot of people tell me I should make myself burp, but I have never been able to do that. The "scaring you" thing just doesn't work. Neither does the paper bag/hyperventilation trick. Sometimes I can get them to subside by drinking a few glasses of water, one right after the other without breathing/pausing. Which is really just the same as holding your breath but like... goal oriented.
And now I'm not sure if I should be saying hiccups or hiccoughs. But I'm guessing "hiccup" is the generally accepted american spelling. Or maybe it's just academic like donut/doughnut.