When they wrote Dracula on for all of one episode
For a show about vampires and vampire slayers, you would think that one: they would have introduced Dracula a hell of a lot sooner than season 5, and two: he would have lasted a hell of a lot longer than one episode. But no. What we got was some lame, melodramatic incarnation of Bram Stoker’s famous villain and the potential of a great foe flushed down the toilet.