Halloween costumes
One of our sons attended kindergarten at a school with a lot of trees around it, including osage orange trees. The osage orange produces fruit in autumn which fall on the ground, right in time for Halloween, about the size of a grapefruit, light green with a wrinkled, convoluted skin. We dressed up the kid in an old scrubsuit, cap and mask (my wife is a nurse and brought a set home from the hospital where she was working), gave him an imitation scalpel and an osage orange fruit and he went out as Dr. Frankenstein carrying this "brain". It was a tremendous hit. To this day, we refer to osage orange trees as "brain trees."