When Guybrush wondered if the ultimate insult was made on Monkey Island, the Vood Lady dismissed this, saying that it is too obvious. Although the Ultimate insult was created on Jambalaya Island, Guybrush was able to create another ultimate insult when he was stranded on Monkey Island, with the use of the Giant Monkey Head. The rest of the parts needed for the ultimate insult (a gold man, a bronze hat, and secretly the Gubernatorial symbol of Melee) were combined in order to enter the the robot.
Guybrush needed the Bannana Picker (which was the alternative key to open the monkey head, although entrance to the cavern of meat was sealed), to grab onto a lach which would open the mouth of he monkey head. The Bronze Hat was needed to open the entrence to the control room of the Monkey Robot. The Gubernatorial symbol was literally the key to activate the robot.