You were studying for your oral Latin exam, while your friends were asleep. It was easy to say you were jealous.

Every sentence you spoke, you butchered. You were in the middle trying to read a Latin sentence out loud, when your room dimmed, and a flash of red light exploded behind you. A tall figure emerged from thin air and leaned over your shoulder.

"Wow, you're shit at Latin." the figure said, "I mean, you did summon me."

You accidentally summoned a demon by being bad at Latin.