For an unsettling snack, let the crew make freaky-face pizzas.
Lightly toast English-muffin halves, spread them with pizza sauce, and sprinkle on cheese.
Have each child make a face from such toppings as pepperoni, olives, carrot curls, and other veggie pieces.
Broil briefly to heat the pizza and melt the cheese. Parmesan "dandruff" makes a deliciously vile finishing touch.