I have found a terrific recipe of a drink especially for ;) It is called “Brain Hemorrhage“ (Halloween Alcohol Drink) It is a shot, because you drink at once, just like Tequila.

Original recipe makes 1 shot:

1fluid ounce chilled peach schnapps

1 teaspoon chilled Irish cream liqueur (such as Bailey's®)

1 splash chilled grenadine syrup

Pour schnapps into a shot glass.
Very gently pour Irish cream liqueur over the schnapps. Wait until the Irish cream liqueur begins to clump and 'curdle' to look like a brain, just a few moments.
Gently pour a tiny amount of grenadine 'blood' over the brain.

Watch your guests gag over the look of one of the nastiest-looking Halloween drinks around. But they are yummy!

Try it and have fun.

Source: http://allrecipes.com/Recipe/Brain-Hemorrhage-Halloween-Alcohol-Drink/Detail.aspx?prop24=hn_slide6_Brain-Hemorrhage-(Halloween-Alcohol-Drink)&evt19=1