It's easy to define a spoiler: Any description of an event in a fictional work which would be difficult to predict and that has significant consequences. It's

It's easy to define a spoiler: Any description of an event in a fictional work which would be difficult to predict and that has significant consequences. It's very difficult to determine what trigger warnings should be used in a general case. Should pictures of dogs (especially German shepherds) carry a trigger warning because dogs are often used as attack animals by police and militaries, and can cause traumatic experiences in someone attacked by them? What about birds? I have an acquaintance who is deathly afraid of birds. How about warnings for people with ideophobia (the fear of ideas)? Or all the other things on http://phobialist.com/ http://phobialist.com/ or any other such list. Who decides what list of triggers is legitimate?