In the day where every store bought Halloween prop and most DIY props have some type of controller making things happen in the background it is neat to see a design like this. Youtube user badephemeris has built this  Drum controlled Animatronic Halloween Head. Like a player piano or some of the old music boxes it uses a reads information from a rolling drum to make things happen. In this case the drum contains cardboard bumps which activate microswitches. These switches are then used to control an animation sequence on the head. In this case there is no need to pull out the laptop to change the sequence, just glue in some new pieces of cardboard and call it a day.