One day, Ron tried to deal with an XXX-rated creature. Since competent wizards should be able to cope, Ron obviously couldn't and his spell backfired. All the magical talent and knowledge of spells that Ron had had disappeared, leaving him just the same as before. He also got stepped on by the XXX-rated creature. His head squished like a watermelon that had also been stepped on.
When he regained consciousness, he was in St. Mungo's. Harry and Hermione were sitting in chairs next to him, watching him sleep, as people in books often do, because that's not creepy at all. They were about to tell him what happened when there was an explosion downstairs!
Since explosions were normal in the Wizarding World (especially if Seamus Finnigan was nearby), they ignored it. Then there was a second explosion, followed by a third. They ignored those too, and told Ron why he was in the hospital in the first place.
"It was You-Know-Who," said Hermione. (It actually wasn't, but that seems to be the go-to answer for anything in this franchise, so let's just go with that.)
"No, I don't know who," said Ron. That made sense, because he had just been squished like a ripe persimmon. That had to cause some brain damage.
"No, it was You-Know-Who," said Harry, as if repeating it again would make any difference.
"Who?" asked Ron.
"You-Know-Who," said Hermione. She said it louder and slower, as people often do when they are trying to get someone to understand what they are saying. It didn't work, though.
"What's his name?" Ron demanded.
"We call him You-Know-Who," Harry said, "because he is He-Who-Must-Not-Be-Named."
"That doesn't make any sense!" said Ron.
Harry and Hermione exchanged frustrated glances.
"You know what?" said Harry. "We liked you better when you were unconscious." Hermione reached over and wacked Ron on the head with a frying pan that she had conjured up from midair. He fainted again.
The End