We did this one year when I was a room mother. Think it was for first grade. Kind of a take off on pin the tail on the donkey. We drew a great big witch with a huge nose and taped it to the blackboard.
We then gave each kid a piece of gum. And, had them chew it. Then we blindfolded each kid turned them around a few times and told them to give the witch warts.
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They had an absolute blast doing it. Not often you get to take gum out of your mouth and stick it somewhere.