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Fenton has created demand for a new product before there was even a product, so he uses Gyro's new helium-based chewing gum -- without testing it.
Bubba's grades are deplorable, so Gyro invents a thinking cap for him. Unfortunately, not only does Bubba's brain expand, but so does his ego.
Fenton becomes jealous when the nephews conclude that Launchpad must be GizmoDuck. The rumor spreads, and Launchpad enjoys the limelight -- at first.