I chaperoned my daughter's 8th grade class on their week long field trip to Washington DC, and was one of seven adults who were watching 53 kids. (I had to count the kids daily to and from all DC events, so I remember the number well!) When we went to Arlington National Cemetery, I told the kids that the first peep out of any kid would result with them sitting in the bus for the rest of the day. They knew I was dead serious, and all were very behaved, to the point that I was very proud of them.