Glasses of Nerdicon

The Glasses of Nerdicon are magical glasses that appear in the episode "The Real You" in which Finn gets them from Choose Goose to become smart. However they cause him to go insane with uncontrolled intellect, and he builds a bubble blowing device that creates a four-dimensional black hole. Princess Bubblegum throws away the glasses, causing them to get sucked into the black hole which Finn destroys. The price Finn paid for the glasses was entertaining Choose Goose, which he accomplished by making the finger he used earlier in the episode to get into the worm college lecture.