Harry and Ron's Most Incompetent Moments

"Next Monday," he [Ron] said, as he scribbled, "I am likely to develop a cough, owing to the unlucky conjunction of Mars and Jupiter." He looked up at Harry. "You know her – just put in loads of misery, she'll lap it up."
― J.K. Rowling, Harry Potter and the Goblet of Fire

“Because – oh shut up laughing, you two – because they’ve both just been turned down by girls they asked to the ball!” said Ginny.
― J.K. Rowling, Harry Potter and the Goblet of Fire

“Well, we were always going to fail that one," said Ron gloomily as they ascended the marble staircase. He had just made Harry feel rather better by telling him how he told the examiner in detail about the ugly man with a wart on his nose in the crystal ball, only to look up and realize he had been describing the examiner's reflection.
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“Of all the trees we could've hit, we had to get one that hits back.”
― J.K. Rowling, Harry Potter and the Chamber of Secrets

"This isn't your average book," said Ron, "It's pure gold: 'Twelve Fail-Safe Ways to Charm Witches.' Explains everything you need to know about girls. If only I'd had this last year I'd have known how to get rid of Lavender and get going with... Well, Fred and George gave me a copy, and I've learned a lot."
― J.K. Rowling, Harry Potter and the Deathly Hallows

“Okay, write that down," Hermione said to Ron, pushing his essay and a sheet covered in her own writing back to Ron, "and then copy out this conclusion that I've written for you."

"Hermione, you are honestly the most wonderful person I've ever met," said Ron weakly, "and if I'm ever rude to you again--"

"-- I'll know you're back to normal," said Hermione.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

"Aren't you ever going to read Hogwarts, A History?"
"What's the point?" said Ron. "You know it by heart, we can just ask you."
― J.K. Rowling, Harry Potter and the Goblet of Fire