Quote from : Harry Potter and the Order of the Phoenix Book

Did you kiss?" asked Hermione briskly. Ron sat up so fast that he sent his ink bottle flying all over the rug. Disregarding this completely he stared avidly at Harry. "Well?" he demanded. Harry looked from Ron's expression of mingled curiosity and hilarity to Hermione's slight frown, and nodded. "HA!" Ron made a triumphant gesture with his fist an went into a raucous peal of laughter that made several timid-looking second years over beside the window jump. A reluctant grin spread over Harry's face as he watched Ron rolling around on the hearthrug. Hermione gave Ron a look of deep disgust and returned to her letter.