Pour schnapps into a large shot glass (the measurements may be off a bit, you can experiment). Slowly pour irish cream into schnapps so that it basically forms a "brain" in "formaldihide". Finally, dribble the grenadine (dribbling onto a spoon then into the schnapps helps) directly into the center of the irish cream mass . As the grenadine amount slowly increases it will eventually burst through the irish cream creating a "hemoraging" "brain".