Author's Note: I warn you, here there be Slash. I thought about posting this for a long time, and finally got the nerve...
Disclaimer: If Harry Potter belonged to me, I would be too busy taking money-baths to be writing fanfiction.
Clearly
Close to the end of seventh year Harry Potter kissed Draco Malfoy in the Great Hall and no one paid any attention. There was – at most – a brief moment of silence before the students went back to their conversations. It wasn't as though no one saw or no one cared – it was quite the opposite. In fact, had Draco Malfoy and Harry Potter really been kissing, it would have been the talk of the school in moments. However, since this was clearly a hallucination, no one said a thing. Ron Weasley, whose eyes had never deceived him before, didn't even turn to Hermione to ask "did you see that?" because she was a rational girl and would probably laugh at him when he explained to her what it was that he had seen.
When Harry came back to the Gryffindor table with a delirious grin spread wide on his face, his friends failed to connect it with their hallucination.
"You look happy today," said Hermione.
"Of course I do," Harry replied, "I asked Draco to move in with me once school was over, and he said yes." Harry sighed and dreamily stirred his porridge.
Ron and Hermione blinked. Neither of them had been aware that hallucinations could come in audible form – but clearly it was true. Harry must have said something else, they thought.
Hermione smiled absently. "That's nice," she said, and resolved to visit Madame Pomfrey as soon as possible.