Pour Kahlúa into shot glass to about 1/2 full.
Using a spoon(inverted), slowly pour in the Peppermint Schnapps until glass is about 3/4 full.
Done correctly, the Schnapps will flow under the Kahlúa for a clear layer.
Again using a spoon, but this time right side up, slowly top off the glass with a layer of the Irish cream liqueur
Be careful to place the spoon right at the top of the Kahlúa layer and to raise it as the glass fills up. Done correctly, this will provide a layer of Irish cream liqueur floating over the Kahlúa.
Toss it down all at once for something like a Peppermint Pattie, WITH A BANG!!!
NOTE: Best if all ingredients are chilled