Billy Joel revealed his hydrocephalus diagnosis means every concert is like getting a concussion, and he's not allowed to drive a vehicle.
https://www.foxnews.com/entertainment/billy-joel-says-he-cant-drive-unsure-about-touring-future-after-brain-disorder-diagnosis
https://www.foxnews.com/entertainment/billy-joel-says-he-cant-drive-unsure-about-touring-future-after-brain-disorder-diagnosis