There is also a mouse (pun for a computer pointer) that has built its nest in the middle of Hex. It doesn't seem to do anything, but Hex stops working if it is removed, or if Ponder forgets to feed it cheese (also from "Hogfather"). Hex also stops working (with the error message "Mine! Waah!") if the FTB is removed/disengaged; "FTB" stands for "Fluffy Teddy Bear," which was Hex's Hogswatchnight gift when Death stood in for the Hogfather. (FTB is a pun on FTP, the File Transfer Protocol.) Stibbons is concerned by these signs that Hex might be alive, but dismisses these thoughts, insisting that Hex only "thinks" it is alive.