Adrien Brody was en route to the stage at the Dolby Theatre on Sunday night to collect his Oscar for best actor when it appeared to dawn on him that he had forgotten to do something — something important.

So, halfway up the staircase, Mr. Brody paused and removed a piece of chewing gum from his mouth. But what to do with it? He turned to locate his girlfriend, Georgina Chapman, who stepped forward from her position in the front row as Mr. Brody readied himself to make a softball-style underhanded pitch to her.

It was not a perfect toss. Ms. Chapman had to wheel to her right to catch what briefly became the most famous wad of chewed-up gum in the world. But she delighted in her feat, raising her arms in triumph as she returned to her seat just in time to see Mr. Brody accept his award from Cillian Murphy, last year’s winner in the category.

Mr. Brody was not asked about the gum toss during his backstage interview after his win, so no further details were available about the type of gum it was, or how he decided against simply swallowing it.

It was an unscripted moment for Mr. Brody and Ms. Chapman, whose relationship has drawn its share of tabloid attention. It also served as a bit of levity before Mr. Brody delivered a lengthy speech that focused, almost exclusively, on his hard path back to Hollywood pre-eminence thanks to his role in “The Brutalist,” for which he won the award.

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