Seriously, I took 10 shots of the single pebble in this photo: http://simondeanmedia.co.uk/2009/09/a-daughters-pebble/. The following photo is from the gallery:
During the family photoshoot of about forty minutes I took around 120 photos. (Some of that time was spent controlling the children). We ended up with a couple of montages and a couple of single framed shots. When shooting video always roll at least 5 seconds before and 5 seconds after and always always do it more than once if possible – with documentary style photo and video that’s not always possible, but the key is to take more than you think you’ll need. Start rolling/shooting slightly before you think it will happen.
You’ll be surprised at the shots you didn’t plan. You also get to learn what works and what doesn’t. You can’t practise and test enough. Be prolific.
The more you do it the more great shots you’ll get – and then the pain comes from choosing, not from that missed moment!