After a number of patients reported passing a kidney stone after riding Big Thunder Mountain, Dr. David D. Wartinger decided it was enough evidence to do some research between riding a roller coaster and passing a kidney stone.
© Steven Liebman
Big Thunder Mountain Railroad
Then, they headed to Disney World. With the park's permission, the research team rode Big Thunder 20 times. The seat assignments were random and "determined as a function of place in the waiting line," according to the study.
After each ride the stones were analyzed.
The study concluded that sitting in the back seat lead to 64 percent passage rate. The front had a passage rate of 16 percent.