Chill the shot glass in the freezer for 5 minutes.

Using a jigger, measure 0.5 ounces of vodka.

Carefully pour the vodka into the shot glass, filling it about halfway.

Measure 0.5 ounces of pineapple juice with the jigger and set aside.

Pour the pineapple juice slowly over the back of a bar spoon held just above the vodka layer to create a distinct layer.

Measure 0.25 ounces of grenadine using the jigger or a small spoon.

Slowly pour the grenadine over the back of the spoon so it sinks to the bottom, forming the base layer.

Admire the layered colors and serve the shot immediately while still cold.