United Kingdom, June 18 -- Ben Stiller is making a documentary about the New York Knicks.

The Night of the Museum actor explained he had been seen on his phone so much while sitting courtside during the NBA Finals was because is working on a film about his beloved team in partnership with A24 for HBO, with the help of Madison Square Garden and the NBA.

He said on players Jalen Burnson and Josh Hart's the Roommates Show: "I'm really excited to announce that we are officially making a documentary about the New York Knicks for HBO. And doing it with A24 and official cooperation of MSG. And NBA."

But the focus of the documentary isn't just on the basketball side's recent success, which culminated in their first NBA championship in 53 years...