Mum: [Referring to Ned Sherrin] Goodness, doesn't he look like his dad?
Me: Why, who's his dad?
Mum: I don't know… I'm thinking of someone else.
[Ten minutes later.]
Mum: Robert Morley!
Me: Robert Morley?
Mum: Yes, I was thinking of Robert Morley, and getting Ned Sherrin mixed up with Sheridan Morley.