I got ya covered, here.
Get some water and a chair (you don't really NEED the chair, but it'll make shit easier). Take a swig of the water and hold it in your mouth. Tilt your head down and forward as far as you can (theoretically this would work best if you were actually upside down), and swallow. Repeat approximately fifteen times in short succession, and hiccups will most likely be gone (there's been maybe two occasions in my life this has failed).
The way the muscles in the esophagus are used when swallowing in this manner affects the actions of the diaphragm that are causing the hiccups (I'm not staking my reputation on this explanation, though, its something I learned long ago as a child. Either way, it works.)
mike