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Ronald Weasley almost makes an Unbreakable Vow with the twins
The summer after the twin's turn seventeen, they got Ron really angrier than he'd ever been before. It was just after school ended for Ron when Fred and George Apparated into Ron's room. Ron fell off the bed in surprise considering he was still sleeping when they Apparated in. "Bloody h-" Ron started to shout but was cut off by the twins.
"Hey Ron," Fred said.
"What's up?" George asked.
"I was sleeping! What do you want?" Ron shouted, angry that he'd been woken up so early.
"Well, we just were wondering how your little crush is," Fred replied.
"What crush?" Ron screamed in replied. He was unbelievable annoyed at the twins right then.
"The one you have with a little miss know-it-all," George laughed.
Ron jumped up, yelling how he didn't like her, and never would, and she'd always just be a friend. The twins kept adding fuel to the fire until Ron would say practically anything. When Ron asked the twins to never bring it up again, they told him they would on one condition. Ron had to vow to always take the fall for whatever pranks the twins pulled. In Ron's enraged state he yelled in the affirmative. Little did Ron know that they meant the Unbreakable Vow. The twins got as far as Ron grabbing Fred's arm and George starting to say what he was vowing to before Ron realized what they were doing. Ron jumped back and started yelling at them and ran down stairs to tell their mum. While Ron did this, Fred and George Dissaparated so they wouldn't feel the wrath of their mum that was to come.