Saturday's Astronomy Picture of the Day from NASA featured this fun short video from southern Germany in July. Members of a local school's astronomy club drew a chalk sundial in a city square and took turns acting as the gnomon, the bit that casts the shadow, for 10 minutes each. Pictures were taken (using a Nikon D200) at the rate of once every 20 seconds, so the participants could also perform a bit of stop-motion animation, making the resulting time-lapse a lot more entertaining. (Their explanation in English is here.)
The astronomy group includes both adults and kids. There's also at least one dog and a human skeleton.
The video runs just over a minute and a half.