The great candy ball contraption
Mr. Mordecai has built a different candy dispensing machine out of Legos for Halloween each year for the past three years. Here is this year's (you can see year one and two here and here).
Kids love them, and every year there will be a few who will be especially excited about the machine, who will hang around to see how it works, and possibly to try to get a little extra candy from it.
Mr. Mordecai designs these things himself. He usually starts a few months before Halloween to make sure he can work out all the problems, although he's been so busy this year that it was pretty close!
Inspiration for this year's machine comes from the Great Ball Contraption: