This might need a little more Photoshop to warm it up, but I think it's my favorite from the day.
These kids found boundless glee in attacking this guy with pillows. He'd run away and a trail of kids would follow behind. As he ran his pants kept falling down. Somewhere out there is a shot of his naked butt running from a swarm of pillow wielding kids. I was lucky to snap this one off quickly as they passed. UPDATE: OK, this video explains it.
View the full set here.