Bloody Brain Shooter - mix vodka and lime juice in a shaker and strain. Use a straw to add a little bit of Bailey's at a time, to give it the curdled look and create the "brain," then repeat with grenadine.
Fill a small cocktail glass with ice. Pour your choice of cranberry juice (for a black widow Halloween cocktail) or pulp-free orange juice (for a spooky screwdriver) over the ice. Gently layer black vodka over juice.