A guy at work taught me this and I'm preaching the gospel:
If you ever have the hiccups, challenge them to a knife-fight and they'll be gone instantly.
I don't know how, but it's worked INSTANTLY, and 100% of the time i've tried it, which is about 20 times by this point.
It fascinates me to no end, because there has to be a scientific explanation but I can find none.
It just WORKS.