In Memory of Pappy

Noah and Lukas were reminiscing about their precious Pappy and what a great man he was. One of their last memories of Pappy is Tom's 100 watt smile as he backed up Barney away from the kitchen heading to the office. Since Barney could not turn in the kitchen, Tom was quite proficient in backing up his trusted companion. On his way out of the kitchen, he would make a full stop and open a kitchen drawer and fish out one delectable M&M. Lukas and Noah said they had never seen anyone enjoy ONE M&M as much as Pappy did.
This memory lead them to build an M&M dispenser out of Lego in memory of dear Pappy and his enjoyment of these little chocolate candies.  Coins are deposited on one side, a device keeps track of the coins received for accounting purposes, and with a push of a button the machine dispenses a few M&Ms. The boys could not bring themselves to make the machine simply dispense one.....