Hocus pocus, Abracadabra, Open sesame, Sim sala bim bamba sala do sala dim, or any other phrase or word that gets the job done.

Childhood: "please" and "thank you".

Latin will do in a pinch, too. Sounds cool and you can match contemporary words to their latin counterparts for semi-authenticity.

"Librum ignie!"
FWOOSH
"Zander, please don't speak latin in front of the books."

A poem by an Eskimo:

In the earliest time,
when both people and animals lived on earth,
a person could become an animal if he wanted to
and an animal could become a human being.
Sometimes they were people
and sometimes animals
and there was no difference.
All spoke the same language.
That was the time when words were like magic.
The human mind had mysterious powers.
A word spoken by chance
might have strange consequences.
It would suddenly come alive
and what people wanted to happen could happen--
Nobody can explain this:
That's the way it was.