"There he is, Mom, there he is, look!"
It was Ginny Weasley, Ron's younger sister, but she wasn't pointing at Ron.
"Harry Potter!" she squealed. "Look, Mom! I can see"
"Be quiet, Ginny, and it's rude to point."

Harry Potter and the Philosopher's Stone - Chapter 17 : The Man with Two Faces
See this quote in the Pensive -