If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
There's a very extensive medical literature - although mostly focusing upon persistent (>48 hours) or intractable (>1 month) hiccups. One possible remedy jumped out at me from Google Scholar results: title alone gives the game away (albeit N=1):
Odeh, M., Bassan, H., & Oliven, A. (1990). Termination of intractable hiccups with digital rectal massage. Journal of internal medicine, 227(2), 145-146.
A very recent review by Steger et al (2015) gives good coverage of "state of the art" in acute hiccups:
before concluding in case of persistent/intractable hiccups:
Steger, M., Schneemann, M., & Fox, M. (2015). Systemic review: the pathogenesis and pharmacological treatment of hiccups. Alimentary pharmacology & therapeutics, 42(9), 1037-1050.
Further note: reference [23] above in Steger et al (2015) is "Watterson B. The Complete Calvin and Hobbes. Kansas City, MO: Andrews McMeel Publishing, 2005."
I've got a method that's reliable for me. I pay attention to how I feel between hiccups, observe what seems like a hiccuppy feeling (in the neighborhood of my diaphragm), and make myself stop feeling it.