Luke Wilson fears he made a bad impression on the set of new movie The Family Stone, because co-star Diane Keaton is convinced he needs psychiatric help.

The actor chipped his tooth on a bottle during shooting and Keaton gave him a contact number for a doctor - but when he made the call to what he thought was a dentist, he realised he was talking to a shrink.

He says, "The movie ends and she writes me a nice note and it has the name of a doctor and I call the guy and it was a psychiatrist. I don't know how to take that.

"I think she just kind of thought I was crazy. I think my accent threw her."