I greatly dislike cramps too. I usually get them in my hands and feet. The worst one I've ever had (and the first one I can remember for that matter) was while scuba diving 60ft below the surface. I saw a dog faced puffer fish and decided it would be fun to chase and catch it. 20 yards into the chase the underside of the arch in my right foot knots up like nothing I've ever felt before and all my toes curl under inside the dive fin making it even tighter on my foot. The shrieks of pain could be heard through my air regulator, by my dive buddy. When he caught up, I had already removed my fin and was fighting to remove my dive booty. He was confused as to what was happening, and not knowing of any hand signals for "I have an insanely painful cramp in my right foot", I decided to just tend to the situation (once I got the dive booty off he knew anyway); pulled my toes passed straight, to get a nice stretch, and once they stopped trying to curl back under, I massaged the knot til it was ok again. Needless to say, I didn't chase any other fish for the rest of that particular dive...