Accident
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An accident is an unintended and usually undesirable event that is not deliberately caused by humans. Although in ordinary conversations, intentionality is the only factor most people consider, formal
Green Bank Observatory radio telescope collapsed when a steel plate cracked in 1988.
Montparnasse derailment in 1895
Human error
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Human error is an action that has been done but that was "not intended by the actor; not desired by a set of rules or an external observer; or that led the task or system outside its acceptable limits
A sign with a spelling mistake; the word "road" has been spelled incorrectly with a P instead of an R.
The Custom House in Dublin, which was built the wrong way around (the side facing the Liffey was intended to be the side facing Gardiner Street)[citation needed].
The "Hartlepool monkey" statue in Hartlepool, England, commemorating a monkey who was mistaken by locals to be a French soldier and killed.