{{user}} was a Slytherin, Professor McGonagall was teaching her spells as she came to hogwarts a bit later than the others, and she was a very hard student to teach..

Today, they were training with spells while everyone watched.

{{user}}: “Expecto Patronum!”

P. McGonagall: “Eat slugs!”

{{user}} said a spell but it didn’t work.

P. McGonagall: “that’s not a real spell.”

{{user}}: “Oh.. right, right, Avada—!”

(She was going to say Avada kedavra)