Here is one called the mind eraser:
2 oz vodka
2 oz Kahlua® coffee liqueur
2 oz tonic water
Pour vodka, kahlua, and tonic water into a rocks or old-fashioned glass. Serve with a straw.
Never had one but watched some one drink one of these and she went pretty stupid afterwards
Tried one of these from someone who had one not to bad its called an Irish Trash Can:
1/2 oz gin
1/2 oz light rum
1/2 oz vodka
1/2 oz peach schnapps
1/2 oz Blue Curacao liqueur
1/2 oz triple sec
1 can Red Bull® energy drink
Fill glass full of ice, then add all liquors and stir. Add full can of Red Bull. It will float and slowly seep down the glass, turning the mix green, hence the name Irish Trash Can!
Both of these concoctions sound like they're self induced blackouts.