I have a knitting face...!!

I have just realised - and I had to share this with you - that when I am knitting, I actually have a 'knitting face'. And its not attractive! I sort of purse my lips, and occasionally move them from side to side.....I've been knitting for over 40 years and have only just found this out. Why has no-one ever told me that I gurn while I am working??

I have been trying to not pull a face while knitting tonight, and have ended up biting my bottom lip, looking a bit like the second picture :-$

Does anyone else have a 'knitting face'??