
The duel between Laertes (left), played by Brad Elliott, and Hamlet, with Horatio (background, left) Claudius, Gertrude and other court staff observing.
One such warning stated, "Tragedy is a genre obsessed with violence and suffering, often of a sexual or graphic kind, and so some of the content might be triggering for some students."
The University of Aberdeen in Scotland put a trigger warning on Beowulf due to its depictions of "animal cruelty" and "ableism." Beowulf had to fear "a creature of darkness, exiled from happiness and accursed of God, the destroyer and devourer of our human kind." However, Aberdeen students have the added fear that they may run across depictions from 975 which "place value on people's bodies and minds based on societally constructed ideas of normality, intelligence, excellence, desirability, and productivity." [Notably, even that definition is preceded at Stanford by a trigger warning that "Content warning: The following page contains content including the historical context of ableism. It may be disturbing to those with a history of institutionalization or other negative experiences in the medical world concerning their specific disabilities."]
Even the death of an albatross in Rime of the Ancient Mariner required a trigger warning at the University of Greenwich as "potentially upsetting."
There is trigger warning imposed by the University of Warwick for Thomas Hardy's Far From the Madding Crowd because of its depiction of "rural life."
Of course, the British are not alone in such warnings. The National Archives recently moved to add trigger warnings to displays on our founders and founding documents.
Trigger warning: I am about to quote Shakespeare....
This all proves the Bard's point that "Nothing routs us but the villainy of our fears."
Res ipsa loquitur - The thing itself speaks
Everythins else may be triggering/upsetting.