My wife is an actress and it is her habit always to keep a small memento or keepsake from every production or play she has participated in. When she moved in with me to my London house in 1998 she was unpacking a box of her stuff and I asked her, "Why is my cottage key here?" "That's my key," she said, "it's from a play I was in." I went and found my actual key - one of those large, old-fashioned types - and holding them together we found they were identical. So identical, in fact, that it actually opened the door to the cottage.