Have you ever had to pretend to be enthusiastic about project decisions you didn't agree with? Have you ever had to mask what you would like to say to prevent conflict with a problematic manager or co-worker? Have you ever had to force yourself to be polite, cheerful, and friendly to a customer who really didn't deserve the courtesy?

Other examples:

https://www.usatoday.com/story/news/health/2019/04/26/custom...

https://en.wikipedia.org/wiki/Smile_mask_syndrome

https://digest.bps.org.uk/2017/02/24/theres-such-a-thing-as-...