Why does Toby speak the magic words when in people could fly?

You are likely referring to the movie "The Princess Bride" and the character Westley, who is played by Cary Elwes. Westley, not Toby, is the one who uses the magic words "inconceivable" in the film.

Westley uses the phrase "inconceivable" repeatedly, often in response to absurd or illogical situations. He uses it to express surprise, disbelief, or even annoyance at the absurdity of the situation.

The magic words "inconceivable" are not actually a real spell in the movie. Instead, they are a way for Westley to poke fun at the absurdity of the situations he finds himself in. His repeated use of the phrase becomes a running gag, and it eventually becomes a sort of catchphrase for him.

It's important to note that the phrase "inconceivable" is never actually shown to have any magical properties in the movie. It's simply a way for Westley to express his own disbelief at the world around him.