I was thinking the other day about trends. Think back over the decades and how generally the majority of people will feel or like or dislike the same things. People comment how awful and ugly things that trended in the past were. Things that are trending and popular now not long ago would have been thought of as ugly as well. I even have noticed in myself at times my likes after a trend is deeply going to at times like it as well.
Aside from trends when there is horde mentality and big change as well.
If it is true then I would imagine it works by a way in which the more people who are doing it and thoughts surrounding feel on something the more influence it has to possibly change your thoughts as well.
When a disaster is coming and animals seem to know, it would be a similar situation as well.