Have you ever talk to someone and think wow you have the personality of a paper plate!?

YES A psychiatrist when I was in the hospital for my stroke after Vickie passed. That's when I first started using the expression stone face. He came to offer medication for potent meds for depression and anxiety for my grief.
All I wanted was for him to get the hell away from me. I've already seen my doctor for that. OMG it was like looking and talking to a brain dead Frankenstein.
The actual Frankenstein would have been more welcome.