I know what to do when Mexican hosts offer plate after plate of sincerely given delicacies. I tuck in with gusto. It is afterwards when I feel unable to move or speak that my options for further action dry up.

I´m glad I know that entire spheres of human endeavour are of no benefit to me. But I didn´t pay 110 dollars just to panic at the memory of a near-death experience and sit out the dive on the boat.