Liz and Robert have arrived to collect Maggie for a picnic, but she refuses to go unless Arthur joins them. She wants to relive the family picnics of the boys' childhood, but things don't quite work out as planned. After a lot of singing and a little confusion over the location (it looked different 30 years ago), the others refuse to join Maggie in her proposed games or walking. So you could argue that if Arthur, Robert, Liz and the others had been a bit nicer to Maggie, none of it would have happened. But even so, just how can you possibly lose your mother at a picnic?