I had a nurse booking me into a bed in Manchester Royal Infirmary on one occasion.
She started filling out the forms and used the shortened version of my Christian name.
I said "Don't call me that".
She said "Why not?"
I said "Because I don't like it"
She then said "Oh, so what do they call you at home then?"
I replied "Daddy mostly but you can call me Mr Snoopy or Sir"