“…Go on, show them, faithful studen- Sweetie, what are you doing? Tha- That’s not the spell I taught you! Stop this at once!”  
“YOU HAVE UNLEASHED THE GREAT AND TERRIBLE AL-KEL-ALYAL ON THIS REALM, MORTAL! FOR YOUR REWARD, YOU MAY WITNESS HIS GLORY BEFORE HE FEASTS ON YOUR WORLD! BASK IN HIS GREATNESS!”  
“So, what do guys think? Pretty cool, huh? I found him in an old book tucked way in the back of the library! It had tons of stuff like this! Although, it kept growling for some reason.”
 
And this is why magic requires adult supervision.