This is the kind of drink you buy for the chick you're trying to convince to go home with you, but once you taste it and absorb it's powers, you'll order one for yourself:
The Ecto Cooler
4oz Absolut Mandrin (or other orange-flavored vodka)
2oz Midori (or other melon-flavored liqueur)
12oz beer glass
Fill your glass 3/4 full of ice cubes, drop in the cumulative 6oz of booze, and cover with equal amounts of tonic and sour. Stir a bit and garnish with whatever fruit will help get that cute girl into the cab with you. Despite it's demure, green appearance, this cocktail packs a wallop. It won't be cheap - I've paid as much as $9 for one of these in a bar - but it does the trick. It also looks awesome and tastes fantastic. I have never ordered one of these and offered a sip to someone else that didn't result in at least one of them immediately ordering an Ecto for themselves.
There are those who look upon some of my more unsavory habits and call them the cries for help of a problem drinker. I prefer to think of them as the charming misadventures of a dashing rogue.