Imagination machine

The Imagination Machine was imagined by Jake in the episode, "Rainy Day Daydream". He imagined it to turn off his imagination so that he and Finn would not get killed by it. However, since he turned his imagination off, he became very dull, and since his imagination didn't exist, his Imagination Machine ceased to exist as well. However, Finn went into his own Imagination Zone and imagined the lost Imagination Machine, and turning it back on.