The Harpoon Gun is an item found in Jailbreak. It is initially discovered laying next to a dead Whale. One of the Prisoners makes use of it and shoots the other Prisoner, who eventually dies from the wound. The reason why the Harpoon Gun was there next to a dead whale on the roof of the Prison in the first place was due to Gummy Worm Zombie Ace Dick, who made use of his Check Yo'Self Jonah Combat Operandi, which involved summoning said Whale and Harpoon Gun. This Ace Dick merely uses the Harpoon Gun as a mode of transport and never fires it upon anyone but the whale.