Twilight: (blinks) That was predictable...sorry to interrupt your bath time, Princess Celestia, but I need to get back to Ponyville. If Spike makes the slightest twitch, it could set up the mixture's volatile nature!
Celestia: So, Tuesday?
Twilight: That must be him. (teleports out)
Celestia: I have to learn to stop taking baths during Twilight's shenanigans.