I was doing a pre-wedding shoot with a couple a few weeks before their wedding. This is a great opportunity for them to get to know me better and for me to build up the relationship with them. This helps them to relax on their wedding day as they've seen how good they will look in their photographs and so have one less thing to worry about. I asked the bride if she had any questions for me.
"I hope you don't mind me asking, but do you have a spare battery for your camera?"
I smiled and opened up my camera bag to show I had 2 camera bodies, 3 lenses, a flashgun, a set of memory cards and a collection of spare batteries. This was only for the pre-wedding shoot, not the wedding day itself. "Why do you ask?" I said.
"A friend of mine got married recently and the photographer's battery ran out half way through the wedding. She only found out the next day". This raises so many questions - including was the photographer doing for the rest of the day - were they just miming???
The moral of this story - if you think it's expensive hiring a professional wedding photographer, try using an amateur! :-)