During her interviews, Rita Skeeter uses her Quick-Quotes Quill to take notes for her. The quill is acid green, moves of its own accord, and is presumably to blame for Rita Skeeter's exaggerated and inflammatory articles. During Harry's first interview with Skeeter, he watches her test the quill by telling it only her name. The quill, however, records not just Skeeter's name, but her age, observations about her appearance, and tidbits about her reputation. In this way, the quill itself shows Harry that he can't trust everything he reads--by seeing the quill in action, he discovers that even if he or someone else tells the truth, that doesn't mean that the truth will actually end up in the papers. Instead, what does end up in the papers is filtered through someone else with goals and an agenda all their own--and in the case of Harry and his participation in the Triwizard Tournament, that agenda has little to do with the truth.
Quick-Quotes Quill Quotes in Harry Potter and the Goblet of Fire
"Testing...my name is Rita Skeeter, Daily Prophet reporter."
Harry looked down quickly at the quill. The moment Rita Skeeter had spoken, the green quill had started to scribble, skidding across the parchment:
Attractive blonde Rita Skeeter, forty-three, whose savage quill has punctured many inflated reputations--