ok ok people, settle down, it's all right, the guy from the Maritimes is here.
I've cured every hangover I've had in the past few years within an hour.
Do all the following, or a combination it's up to you:
Gatorade: helps restore electrolites as states above, and rehyrates very well. Goes down easier than water when hungover.
1/4-1/2 shot of Rum: this might sound weird, but if you mix a slight amount of rum with your gatorade you can't really taste it, but it will kill the drug withdrawl. As someone jokingly said above, start drinking again, well actually "hair of the dog" works the best I've found.
Coffee/Coke: Once you have the gatorade you'll want to get energy levels back up, coffee or coke should do the trick. I'm not a big fan of energy drinks, so I don't know if I would reccomend Red Bull, but the theory would be the same.
Motrin IB: while as stated above, it will only cover the effects of the hangover. It covers the effects of the hangover!!! There also is trace amounts of caffine in Motrin IB if I recall correctly. I like the 400mg Super-Extra Strength stuff, but only take 1.
Chocolate Bar: I prefer Dairy Milk, lots of chocolate concentrated in a small bar, eat quickly, get the sugar high, and the endorphins (sp) that the chocolate releases
Fruit: blueberries, strawberries, rasberries, bananas, mangos, whatever the fruit will give you the natural sugars, and put something healthy in your stomach to help avoid the grogginess and and sugar/caffine crash from the above remedies
Carbs: I find pasta and carbs help re-engerize me, so again when the short term fixes wear off, you want the long term fix to start to kick in.
There have been morning I've awoken and thought "ughhh never drinking agian" then thanks to some of the suggestions above was back on the horse that night