Melissa McCarthy Breaks Down Her Epic 'Boob Fight' With Kristen Bell in 'The Boss'

It starts with some constructive fashion criticism. Single mom Claire (Kristen Bell) is about to go on her first date in eons, and her-fresh-out-of-jail ex-boss, Michelle (Melissa McCarthy), does not approve of that fact Claire’s wearing a nursing bra underneath her blouse. It soon enough escalates into full-on breast slapfight.

It’s the funniest scene in the new comedy The Boss, and, according to McCarthy, it was all fueled by bananas courtesy of her co-writer/director/husband Ben Falcone. “It was just before lunch, and he was like, ‘I knew you guys needed your energy.’ So he fed us bananas, like monkeys,” McCarthy told us at the film’s Los Angeles junket (watch above).

Related: Melissa McCarthy’s 'Boss’ Character Not Based on Who You Think She Is

It worked. “We got right into the boob fight, and we got much more aggressive. Our blood sugar was up. So it may have [ended up] a little more aggressively than we thought.”

The Bridesmaids and Spy actress said it led to so much laughter she was surprised Falcone could even find enough footage of them to use while straight-faced.

“At a certain point are you mauling each other, which is not something I really do in my day-to-day life.”

The Boss opens everywhere Friday.