That's why you swim first, not last!

People have asked me why we do the swim part of the triathlon first, not second or third. Tonight I figured out exactly why... because it if was last, we would all die. Those people in the kayaks would be fishing triathletes out of the water right and left. I went to the evening swim today rather than the morning swim (thanks very much to 2am paper writing). The swim was after speedwork on the bike and my feet and legs cramped up so many times during the swim it wasn't even funny. And this is why the swim is first, not last, in a triathlon - so your legs aren't tired and prone to cramps :) Any suggestions for fixing the cramping in the legs problem? Am I not eating enough bananas?