Brown and blue. The colours of the Weasleys' eyes.
Bill, Charlie, Fred, George and Ginny all had Molly's brown eyes; only Percy and Ron took after Arthur.
Looking into Ron's angry blue eyes, Charlie silently watches as Ron rants and kicks over furniture furiously, the remains of a letter cremated in the fireplace.
"Get a job! A JOB?!" Ron screeches, "A proper job! What, dragon tending doesn't qualify anymore? A year ago, she wasn't all too pleased they opened a joke shop, oh no! But now the money's coming in, it's all "Why can't you get a proper job like George?" Well, guess what Mum? I'M NOT GEORGE!"
Ron smashes Charlie's lamp, and then screams as he sticks his leg through the coffee table.
After, when Charlie heals Ron's shin and wipes away his livid tears, he internally curses Bill, remembering all the Percy-bashing the twins got up to when he became Prefect; the spiders Ginny set on Ron when he recalled an adventure with the Harry Potter; the cold shoulder he received from Percy after winning a Quidditch match. Bill never had to experience any of the trials of being a younger sibling.
Because while brown and blue are the colours of the Weasleys' eyes, occasionally the younger siblings turned green-eyed.