In the intro to Dan Aliely's new book he describes dealing with his own medical compliance problem: he had to take some very rough hepatitis meds that made him nauseous, He essentially bribed himself with movies, which he liked a lot, specifically arranging the details to create positive associations (he would start the movie right away after giving himself the shot, before the nausea would set in). He was apparently the only one who finished the course (the treatment was experimental), so +1 for behavioral economists.