Witchy Warps are pads found throughout Banjo-Kazooie: Grunty's Revenge. They are used to take Banjo and Kazooie to a world's boss battle, but need to be activated first. This can be done in many ways, as the method differs in each world, but are generally actions such as pressing switches and firing eggs into tolls, among other ways.
The Witchy Warps initially have an image of Mecha-Grunty in them, but it changes to one of Banjo after the boss is beaten. It is also impossible to re-use the pad once this happens.