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Octavia Spencer played a huge role in Neil Patrick Harris's longest running joke of last night's Academy Awards, in which he gave her the task of guarding a locked-up briefcase containing his Oscar night predictions. But did the actress (in Tadashi), know that she'd be chosen for the job ahead of time? "I had no idea!" she told InStyle at the Governers Ball after-party. "I had a ball, though---it was so fun."

Regardless, she played along with the joke like a champ. As Harris repeatedly checked in on her throughout the night to make sure she was still watching the locked case, she gamely went along with the bit. "It was hilarious," she said.