For vampire's "blood": Pour corn syrup into a shallow bowl, add 2 to 3 drops red food coloring, and stir. Dip the rim of a glass into syrup mixture. Turn glass upright so syrup drips down sides; let set for 1 minute.
For "champagne": Fill prepared glass 3/4 full of seltzer. Add a splash of cranberry or apple juice. Garnish glasses with gummy worms if you like.