Definition: an abrupt occurrence or rapid occurrence or transition
Etymology: Latin: non sequitur, from the root “sekw-” which means “to follow.”
non sequitur was popularized in the 1530s to refer to an inference that doesn’t follow the premise.
In a Sentence
Considering he was recovering quickly, his sister’s death was an utter non sequitur.
The non sequitur throws off the audience. Example: “My car broke down. I wonder what my mom is doing”