The Beauty Transfer Machine is a machine that Gruntilda attempted to use in Banjo-Kazooie to transfer her ugliness into Tooty and Tooty's beauty into herself. It consisted of two pods, one for each person to be placed in. With the press of a button by her henchman Klungo, the ugliness and beauty of each subject would be transferred to the other. If the player receives a Game Over and Grunty wins, she'll turn into a pretty and thin witch while Tooty becomes a fat and ugly green bear. However, Gruntilda's evil motives were foiled by Banjo and Kazooie and Tooty was saved.
The machine's design may be a reference to the 1958 movie The Fly, its sequels, and its remakes in later years.