Why Tom Selleck was asked to break up Princess Diana’s dance with John Travolta: Memoir

“Magnum, P.I.” star Tom Selleck pours out fond memories as thick as his famed mustache in “You Never Know: A Memoir” (Harper Collins, 339 pp., out now).

Selleck, 79, is working on his final “Blue Bloods” season. He writes about life lessons, his charmingly accidental Hollywood career, and the global superstar ride spurred on by his iconic 1980 “Magnum” role as the famed Hawaiian-shirt-loving private investigator.

“You Never Know” dishes nice, doesn’t settle scores or talk politics, and the “Magnum”-heavy memoir doesn’t dwell on Selleck’s movies like 1987’s “Three Men and a Baby” (or even discuss his long-running “Friends” role as Courteney Cox’s much older boyfriend).

Here are Selleck’s best “You Never Know” revelations.

Selleck won despite being a double ‘Dating Game’ loser

A University of Southern California basketball player and underachieving student, Selleck got his Hollywood start on the blind date competition show “The Dating Game.” Selleck’s first TV appearance, pitted against two other bachelors, was a disaster with nervously bumbled responses to the female contestants’ flirty questions.

“I had lame answers, and I lost. I wasn’t funny. I didn’t enjoy it,” he writes. The producers called for a return appearance. “For some bizarre reason, I went back. I was still terrified. I still wasn’t funny, and I lost again.”

The double loss somehow turned into key career moves. Selleck got a Pepsi commercial and was noticed by a casting director.