From Forbes:
"In addition, people who were knocked unconscious even once had a 35 percent increased risk of developing Parkinson's, Dick said."

Although I've never been knocked unconscious because I'm too thickskulled, I've had bazillions of bad head injuries. Almost anyone who has grown up on the back of a horse has had head injuries. The worst one resulted in neurological damage, a seizure long after the injury, dilantin, an EEG, and a neurologist I went to once or perhaps twice. He was Italian. Dr. Montefiori, I think his name was. He was rather difficult to understand as he spoke with a strong accent. He told me that the thingummies in my brain were not firing at the same time, as they should. I took the dilantin for a short time then chucked it. That was ages ago - early seventies.

The good news is that I'm sure to be dead long before that particular valentine is delivered - yippee!