"Oh, thank Paracelsus. If you’d have got out that could have been quite catastrophic."
-- Newt Scamander to Frank the Thunderbird (WFT)
Exclamation by Newt Scamander when he realized that Frank the Thunderbird had not escaped from his suitcase (WFT).
Paracelus was a famous wizard and alchemist (FW). Peeves the Poltergeist once tried to drop an ugly bust of Paracelsus on unwary students at Hogwarts (OP14).