In Napier last month a boy had to be freed by firefighters after getting an arm stuck in a vending game machine at Kennedy Park Resort. Photo / NZMEIn Napier last month a boy had to be freed by firefighters after getting an arm stuck in a vending game machine at Kennedy Park Resort. Photo / NZME

Firefighters removed the door to a vending machine to release a boy's stuck arm last month.  Photo / NZMEFirefighters removed the door to a vending machine to release a boy’s stuck arm last month. Photo / NZME

An increasing number of vending machines now feature “fall sensors” that trigger refunds if paid-for items don't drop. Photo / iStockAn increasing number of vending machines now feature “fall sensors” that trigger refunds if paid-for items don’t drop. Photo / iStock