"Goodbye Hagatha Home" is a script found in Gloria's Theater in Psychonauts. It is one of the scripts required to access the catwalks above the stage. Razputin acquires it by climbing a ladder on the third stage set while the script The Day the Mail Boat Finally Came is being played out.
When the script is played, a balloon will be lowered from above the stage. Razputin can then use the balloon to get up to the catwalks and finally confront the Phantom.