Well, it's definitely NOT something I'm proud to repeat or anything, but for about the first 2-3 months of my 2nd marriage, and ONLY when we were in public, I was always calling her by my first wife's name.
She was always a good sport about it, but that just embarrassed me even more as it made me look like even MORE of a dumb ass than I already was.
(that was back in '90, and to this day I still can't understand why I did that )
)