George knew they should be actors, they were doing a great impression of being surprised, or at least he thought they were.
He put his hand on Harry's shoulder and smiled innocently, probably failing miserably at it. "This is new?" He looked at the swamp trying to pretend he never saw it before. He scanned the crowd, checking the students for their reactions. It was easy to notice that most were enjoying the show and ignoring the swamp smell. The first professors started to arrive but he didn't see the one this little gift was meant for, the Toad!