Fill a drinking glass with room temperature water.
Take a deep breath.
Exhale all of your air (without breathing any back in).
Push out a little more air - there will be some!
Take a sip of water.
Breathe in a little through the nose.
Drink some more water.
Repeat steps 6 and 7 until you can't breathe in anymore.
Finish the glass of water on your last sip.
Breathe in a little bit more.
Hold your breath as long as you can.
Exhale.
Breathe a sigh of relief--your hiccups are gone!