My MIL babysat for us a month ago, while she was here she mentioned she'd seen the film The Duke at the cinema. She said she quite liked it and described it as a caper kind of film. We went for lunch today and FIL mentioned them having seen it but MIL denied any knowledge of it. We described the film and even showed her the trailer but she could not remember having seen it. She seemed quite perturbed that she couldn't remember it.
I mentioned it to DH on the way home but he brushed it off but I thought it was bizarre tbh.