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Ron when he laughed at you.
You were in potions class with Snape, who had decided to give you a particularly difficult potion to brew, you had gotten the ingredients wrong and it blew up in your face.
Ron burst out laughing as you grinned at him, but your face went slack when you saw Snape behind Ron, who didn't notice anything.
Snape smacked Ron over the head with his book. Ron stopped laughing pretty quickly.
