Following reports from patients that riding BTMR caused them to pass kidney stones (one guy rode it three times and produced a dick rock each time), a team of urologists decided to delve into this subject with the no-nonsense rigor and seriousness we expect from science ... and a 3D-printed kidney. As in, they printed a replica kidney, filled it full of some of that urine they keep handy just for these occasions, sprinkled in a few kidney stones, and set it loose on BTMR.
The results? It's all location, location, location if you do/don't want your body to learn a painful new trick. When the fake kidney was placed at the front of the ride, it only passed the stones 16.67 percent of the time -- compared to a 63 percent success rate at the back. Just to make sure that this wasn't an effect of general roller-coastering, the urologists also strapped their creation into several other rides at the park, to no avail. They then took the kidney for ice cream and bought it a $10 Mickey-shaped pen.
So there you have it, folks. If you want a surefire way of dislodging a troublesome kidney stone, or if you're just into groin pain, get yourself a vacation to Disney World. We don't know why they don't put this on their marketing materials, to be honest.