Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
This actually has more practicality than that if you think about it.
This would be great for physical therapy monitoring if the patient were say, swimming.
Also, a friend of mine had a heart condition where she had to wear these nasty heart monitors with wires to a pack on her hip for over a month for diagnosis. They'd get tangled in her clothes all the time and come off, then her phone would start ringing and someone from the monitoring office had to tell her to reattach a pad.