Ben Stiller and Robert De Niro last combined forces as Greg Focker and Jack Byrnes in 2010's 'Little Fockers'

Season 2 of 'Severance' premieres Jan. 17 on Apple TV+

The actor says the MPA board "thought it was too close to f---er" at the time

"It's very hard to analyze why critics like something or don't," the actor said during his 'Hot Ones' appearance

Longtime friends Ben Stiller and Adam Sandler will next share the screen in 'Happy Gilmore 2'

Downey Jr. appeared in Blackface in the 2008 satirical comedy

The actor is dad to daughter Ella, 22, and son Quinlin, 19, whom he shares with wife Christine Taylor