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The boss for the first level of my mobile game currently named Project: Iron Sky.
It uses the same naming format as the famous 'Big Ben' except it is 'Large Johnson' which also translates into hilarious innuendo.
It is encountered by the player, then falls down, blasts off using a concealed rocket off the screen. When it reappears, it is on the players altitude, hence the massive sprite size increase. It fights with concealed guns, fireworks and even a cannon.