Has anyone else ever had an involuntary look of disgust that you couldn't make go away?

I was with a person and they began eating like a starved demon. I'm not a judgmental person, if you were there, you would understand. Stuff all over their face and everything, and this was a grown adult in her late thirties.

I felt a very noticeable look of disgust come over my face and no matter how hard I tried to hide/change it, I could not make it go away. It was like "disgust palsy". Even if I tried to smile it was a smile of disgust...


Anyway, just wondering anyone else has ever experienced this.