A's son, Levi, was forty-five years old and worked as a trucker. On a cross-country trip, Levi became ill and was taken in and cared for by a stranger, S. Unfortunately, Levi died. When A learned what S had done, he called S and promised to send a check for $1,000 to compensate S for her trouble. If A later changes his mind and S sues to enforce his promise, the most likely result is that: