Ron Livingston has confessed after working with Anna Kendrick on Drinking Buddies he still doesn't know what to expect from her.
The Boardwalk Empire star said working on the improvised comedy about friends at a Chicago brewery was a very strange experience.
Ron said: "It was a lot of fun. It was just like free-wheeling. It's great when you get to discover the story together. You can't cheat when you're doing a movie that way because you really don't know what's going to happen next.
"Like Ross McCall might appear and kiss you on the cheek, anything can happen. It's live."
But despite all the improvising alongside Pitch Perfect star Anna, Ron admitted she remained an enigma.
He said: "Anna's a fun girl. She's so good but I'm not sure about her. In one life she could be like a librarian and in another life she could be Vegas stripper and I just don't know which way she's going with it, and she kind of walks that edge.
"It's hard to get to know her really well."