Using a black permanent marker, draw a jack-o’-lantern face on the outside of a clear plastic cup.
Fill the cup with ice, then pour in the orange soda, leaving about 1 inch of space at the top.
In a separate cup, combine the half-and-half and vanilla syrup.
Using a milk frother or whisk, froth the mixture until foamy but still pourable.
Pour the vanilla cold foam over the orange soda.
Serve immediately and enjoy.