Have wizarding world-inspired toppings for your ice cream parlor.
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Make it an Ice Cream Sundae/Soda Party.
Offer a variety of toppings to make your own sundae. Along with all the traditional items like fudge sauce and candy sprinkles, offer Troll bogies for fun. (Lightly color corn syrup, maple syrup, or Lyle's golden syrup with a slight green tinge using food coloring or powdered drink mix.) Young boys tend to enjoy this, for some reason.