The Nail -
A recently retired fellow had been hearing about his local railway museum so he decided to visit one Saturday. He met a couple of volunteers that were rebuilding a wood bodied boxcar and they asked if he wanted to help. He had carpentry experience so he jumped right in adding sheathing to the inside of the car. Before he knew it, the day was over and he headed home. His wife asked how things went and he told her about the project. She seemed concerned that he would spend too much time there so he said I may go back every once in a while. Later as he took his keys out of his pocket he found a nail left over from the sheathing job. The next weekend he told his wife that he accidently brought home something that belonged to the railroad and needed go back to return it. He spent another day working on the boxcar and making new friends. At the end of the day he drove home with, you guessed it... the nail still in his pocket. He told his wife well I had such a nice time meeting new friends that I forgot to return the item so two weeks later he went back to the museum. That was 15 years ago and he is still a regular volunteer with a nail in his pocket.