I scoured my memory for some acupuncture point that might help. Hiccups are sudden, involuntary contractions of the diaphragm muscles, so I thought of using one of the lung points (the diaphragm being involved in breathing) on the arm. So while chatting away at friends across the dinner table, I pressed Lung 6 on one of Brian's forearm for a few minutes. Lung 6 (Kong zui or Maximum opening) is an acupuncture point used for acute respiratory conditions such as asthma, wheezing or severe cough.
Sure enough, after a few moments, Brian's hiccups stopped. A nice way to end the evening.