h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Great entry. I think you could mention taking spare film too.

Another hint is if you are in any way involved with organising a wedding you can buy for about £6 a disposable camera which includes film developing. Place one of these on each table at the reception and get the guests to take some of the pictures. If Great Aunt Maude isn't in the main professional photos she's bound to be in one fo the snaps and when she visits you make sure she sees a picture of herself.

While at a wedding a while ago the photographer had to get everyone positioned and as usual everyone pretended they shouldn't be in the picture or needed cojoling to join in. When everyone was eventually present most people weren't the happy bunnies the photographer needed them to be so positioned the camera and told everyone to copy him. He took in a deep breath - we took in a deep breath. He blew a raspberry and some of us blew raspberries while the others burst out laughing. A second later he took the picture of the happiest looking bunch of wedding guests I've ever seen.