Sometimes you are so convinced what you thought is right and you oh-so-confidently state it loud and clear.
For example, the music notes.
He sung ‘La Ti Da’.
La Ti Da?
Yes, ‘La Ti Da’! Don’t you know the notes?
Yes, I know the notes. I studied music.
‘La Ti Da’!
No, ‘La Ti Do’ you mean.
-.- good gawds.