Many, many years ago I was on a school trip to Jodrell bank and Trentham Gardens (I think) - anyway we were Year 7s and my Dad was in charge. Everything was going well (I bought an Airfix model of Apollo 11 that day that would take me the next two years to complete) until we stopped at a service station on the M6. My Dad and I were on the same coach - about 20 minutes after we'd left the service station one of my friends came up to me and said "Fred and Joe (not their real names) are not on the coach. The other kids volunteered me to tell Dad as we were related and I duly did. To say he was not pleased would be something of an understatement but we quickly came off at the next junction and headed back again (it was now dark). We found them - Dad practiced his shouting and we returned back home - arriving back about an hour late. To be fair to Dad it was actually another teacher that was supposed to do the head count and in due course they got a bollocking for it. But it was a bit tense at home for a few days - I built my model quietly in my bedroom.