Harry was walking down the steps from his dormitory, where he had been, ahem, er... doing what (to him) any normal teenage boy would do with the solitude of his bed.
Seeing as this was Harry Potter, he was having a conversation with Neville, because he's just innocent that way.
He noticed that he was rather hungry and cast a Tempus charm only to find that it was dinnertime.
He said goodbye to Neville, who was sick, and promised to bring some dinner to him. He waved one last time and opened the door and started walking quickly down the stairs to go to dinner at the Great Hall.
As he descended, he briefly wondered where his freckled best friend was.
'Maybe he's already at dinner.'
He shrugged and continued walking, until he reached the common room where he was met by a horrific and shocking sight.
Ron was wearing a suit for some reason- all neat and clean and pleasant.
Which was the exact opposite of the Ron Harry knew.
Dazed, he watched as Ron bowed sweepingly, lifting his head to charmingly grin at -was that Pansy Parkinson?- Pansy Parkinson, who giggled and took his hand. "May I escort you to the dining, fair lady?" he said as he offered an arm.
"This is madness." Voldemort said dryly.
Harry nodded emphatically, then realized it was Voldemort who had said that.
Huh.
'Who knew that ol' Tommy had a sense of humor? Wait. Why is he in here, and why isn't he trying to kill me?'