I don't know how well this will translate, but I was talking to a friend's sister, and I called her "Amanda."  She corrected me and said her name was "Sarah." And I was like, are you sure?  (Obviously she knew here own name...)  She asked me why I thought her name was Amanda.
I told her because her brother once told me she had a doll named "Amanda" which she called "Demanda" when she was little and that the doll was named after her.

Does that make sense? He'd been remarking that she should be called "Demanda" and I didn't get it. And ended up making a fool of myself and getting him in big trouble too...

Ouch.  

Those who can make you believe absurdities can make you commit atrocities. -Voltaire