Usually, celebrities refer to their co-stars as their second family.

In some cases, these on-screen partnerships even lead to romantic relationships.

However, not all actors are as harmonious as they may seem on-screen.

NCIS Tony, Abby and Leroy

As seasoned performers with strong personalities, it’s not uncommon for differences to arise on set.

They were reportedly among the long list of co-stars who didn’t get along in Hollywood.

Despite their strong chemistry on the show, their working relationship while filming wasn’t as relaxed.

Michael Weatherly smiling sunglasses

Weatherly and Harmon shared the screen for years until the former ultimately left the series in 2016.

What’s going on?

The water goes down the drain the other way for me.'"

Michael Weatherly, Cote de Pablo, Mark Harmon, and Pauley Perrette posing together

And Harmon looked at me like, ‘That is your CNN answer?'"

Despite these claims, TV executives were apparently open to having him back.

Why did Weatherly leave the show in the first place?

Weatherly had contemplated leaving the show for years, especially after Cote de Pablo’s exit.

The series ran for six seasons from 2016 until 2022.

As mentioned, he was keen on returning to “NCIS” shortly after “Bull” ended.

Meanwhile,Mark Harmon left “NCIS” in Season 19.