In western Europe / North America, we are not so used to seeing our fish served at the table with the head still attached. In Thailand, and most of Asia, this is perfectly normal. I remember one of my first nights in Thailand, a few years back, I was at a riverside restaurant in Bangkok, and, naturally, fish was special of the day, which we ordered. I do not remember what type of fish it was but it was served with the head still attached, small, wide, bulging eyes open. For just a minute or two I found this disconcerting, but then my Thai companion happily plucked a fork into the eye, pulled it out, and ate it. I laughed to myself, remembered I was in Thailand, and reasoned that if I had a problem seeing a fish head on my plate I should probably leave Thailand and never return. The fish itself was delicious.
A few years on I would now find it disconcerting if my fish was not served with head attached. Mind you, I still do not actually eat the fish head or the eyeballs, but the local soi cats are happy about that as they tend to be the beneficiaries.
This little fellow lives around the Sukhumvit Soi 6/8 passageway and was the happy recipient of my discarded fish head a few months ago.