The giant cannon is a feature in Presto's Edge. It can be charged by using Zap. Along with the cannon being charged, dragonflies will appear, which are worth coins if you use your mouse and scroll over it, and are only visible to the person who zapped it. ( It only happend before, so now it can't do it.)

Once in a zapped cannon, a person will be launched to Skytown Skate Park. If the person isn't in a charged cannon, they will just be blown in the air and randomly land somewhere in Presto's Edge.