I tend to finish with a ", that is." in a couple of situations:
I come in and see a heavily damaged machine, and I say
A lost cause, that is...
And it is not always with the "that is" phrase, it also happens with "I say":
I am discussing with someone, and I say:
Your arguments are baseless, I say.
Is this kind of "ending" for my phrases correct, or is it some kind of absurd bad habit I developed?