Opinions make the world an interesting place, but some people might go to extreme lengths to make sure other believe what they believe. Some people get angry when a person has different opinion.
Person 1: I believe in X, that's my opinion Person 2: Y is better, I'll hurt you if u don't believe in Y
Person 3: STFU bitches, Z is better
Contrary to what many people who add 'definitions' here think, Opinion is not the same as Definition. Opinion is the usually biased twisting of facts based on someone's viewpoint. Definition is impartial fact.
Opinion: "The USA is a country full of ignorant, fat rich bastards who exploit poorer countries so that they can munch more burgers and get even fatter"
The one thing on Youtube that starts a whole month-worth of comments. Alot of the opinions are not stated, so people tend to flame those who don't like a well-liked video.