Organized bike rides are also good moments to have sudden health problems, like a heart attack. Last year during a multi-day ride there was a guy that collapsed at the top of the third 15%+ hill in a row. At the top of that hill there were about 60 other riders having a break and a bit of water in the shade. An ER doctor and his registered nurse-wife were there and coordinated the ressussitation team which also comprised two GPs, one cardiologist and one surgeon (who knows what can happen...), as well as a couple of nurses. Mostly he and his wife did the work, and indeed ressussitated the guy (who was incredibly lucky) in about two minutes. Needless to say, this was scary, but we were all very relieved when the guy came back on his feet (and scared again when he started screaming to death). Anyways, the ER guy just waited for the ambulance and kept going with his ride after. Impressive...