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.
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”