Brain freeze has its own randomised trial

In 2002 a Canadian eighth-grader and her father, a family medicine academic, published a randomised trial of ice-cream headache in the BMJ. 145 students were randomised to eat 100 mL of ice cream either in under 5 seconds or slowly. Eating fast brought on more headaches. They ran the trial in winter to test the claim that it only happens in hot weather.