If you find a magical incantation and the effects of said incantation are bad, it might be a good idea to not read it out loud.
- In The Evil Dead the characters find a recording left by a researcher, which includes the incantation to summon the Deadites.
- Parodied on Phineas and Ferb in an old mummy movie where an archeologist reads an incantation that will make a mummy come to life and follow his every command. He then exclaims "Well, pummel me with a chicken!" and the mummy proceeds to repeatedly beat him with a rubber chicken.