now i'm not sure if this applies to persistant hiccups, but i've never had more than 3 consecutive hiccups in about 15 years. holding your breath gets rid of them every time.
suck in as much air as you can, and when you've got it all suck in minute amounts more to the point where you might feel lightheaded. wait a few seconds until the hiccups are gone and then breathe 'er out. with normal hiccups, if it doesn't work then you aren't gasping enough air.
persistant hiccups though.. good luck with those, dude.
