Pour peach schnapps first, use the back of a spoon and float Cointreau® and do the same with the Kahlua (use enough to cover the bottom of the glass), now use the spoon against the side of the glass for the Irish cream (only use enough for a thin layer), it should float between the Peach schnapps & Cointreau® giving a cloud like effect. Now drop the Grenadine through the Irish cream creating a mushroom cloud effect.