The thing about Diane Keaton is that you just never quite know what she's going to do next.

Jimmy Kimmel found that out to his peril when the 72-year-old actress appeared as a guest on his show the other night to talk about her new film 'Book Club'.

Demonstrating a scene that she had with Andy Garcia - in vivid detail - it wasn't long before she lobbed the gob on Kimmel, who didn't look like he minded too much at all.

Watch it below: