He didn’t mince his words 👀

However, he admitted there was one notable exception.

Winkler recalled that a recurring guest actor frequently talked about the amount of fan mail he received after appearing on the series. The repeated comments eventually prompted the actor to respond.

“One guy came on as a guest star, and then he was brought back a few times. And he would mention his fan mail. And I said, ‘You don’t wanna talk to me about fan mail. I got 50,000 letters a week.’”

Winkler explained that he wanted everyone on the set to remain focused on working together rather than comparing their popularity.

“We don’t talk about that on the set. We are all here as one.”

Despite that conversation, Winkler said the behavior continued.

“And he kept doing it, and he was an assback.”

Although Winkler initially chose not to identify the actor, he later offered a clue by saying the performer had played the character Eugene. Many longtime *Happy Days* fans recognized the reference as Denis Mandel, who portrayed Eugene Belvin in ten episodes between 1980 and 1982. Mandel later appeared in television series including *Knots Landing* and *Homefront* before leaving the acting profession. Reports indicate that media outlets have attempted to contact Mandel for comment, but no public response has been made.