Pour the sour apple schnapps into a 1 1/2-ounce shot glass. Gently pour in the grenadine. (It will sink to the bottom to make the red layer.) Shake the bottle of cinnamon schnapps, then turn the bottle upside down to bring the gold flakes to the top. Measure out 3/4 ounce. Hold a small spoon upside down inside the glass, directly over the apple schnapps layer. Gently pour the cinnamon schnapps over the back of the spoon to make the third layer.