Fill a footed soda glass to the rim with pebble ice.

Pour the cherry syrup and the vanilla syrup over the ice together and let them settle before adding anything else.

Tilt the glass and pour the Dr Pepper slowly down the inside wall until the foam rises near the rim and then drops back down.

Pour the heavy cream over the back of a spoon so it clouds the surface in streaks rather than disappearing into the dark soda.

Stir once, slowly, with a straw to pull the cream halfway through the glass, then drop the cherry on top and serve immediately.