Don Knotts
Known for playing kooky and light-hearted characters on The Andy Griffith Show & Three’s Company, his real life was anything but.
He grew up in a home with a schizophrenic father, who’d come after him with a knife. After his dad passed, he was raised by his mom, who was already 40 when he was born. She died at age 84, when he was only 13.
He spent his life wrestling with hypochondria and macular degeneration quietly, while portraying a goofy exterior.
I was just going to comment on the math but you beat me to it.