A hiccup cure that really works

I think I will avoid that technique, thanks. But if anyone would like to know a more sanitary cure, here it is: Ask a simple maths question.You don't want it too easy - e.g. 4 + 4; they won't have to think - they already know the answer by rote.
You don't want it too hard - e.g. 6432 / 327; they will just refuse to do it.
You want a questions slightly trickier than easy - e.g. 17 x 8
(If they are good at mental arithmetic then you may have to add an extra digit.)There are different questions your could ask, but maths questions can be "self administered".