I am reminded of "Χαμογελα ρε μαλάκα, τί σου ζητάνε;". A book by a Greek communist who spent some time in exile during the years of the military Junta (in the '60s). The title can be translated as "Smile you malaka, how hard is it?". I believe it refers to an incident when, in exile, after days of torture and incarceration, the author or a friend of his is asked to pose for a photo for the authorities, and smile to make it look like he wasn't on a secluded island prison surrounded by fascist police who enjoyed beating the soles of his feat with their clubs.
Yeah, sometimes a smile may not make you feel good, sorry.
Edit: I possibly misremember the reason for the request to smile. It could be the following passage where a Security commander promises to let the just-arrested author go if he but smiles:
