Which of these voices wasn't a choice for the House AI in "The Simpsons Treehouse of Horror" short, House of Whacks?
Explanation
The reason George Clooney wasn't a choice for the house AI in The Simpsons' "Treehouse of Horror" short "House of Whacks" is that the episode was released in 2001, and his voice cameo didn't occur until 2007. Therefore, at the time of the episode, George Clooney was not an available choice for the role.