I just told Joseph (who had his in sept just after he was 4) that if he didnt have them he wouldnt get to school and it did hurt but not as much as staying at home with my ALL day when he wasnt allowed to school

I did buy him an ice-cream afterwards.
(problem was when he had to get his flu jab and he wouldnt go to the nurse because he didnt need the jab because he had had his for school!!!)