f'nar / F'Nar / fNAR / FNAR / F-Nar / F-nar ...
You make a mess of everything just because you felt like being a pain in the ass and no one asked you to.
He ruined my dinner for no apparent reason. It was already done.
She tripped over nothing for no apparent reason. No one saw it coming.
He started a song in the middle of the movie for no apparent reason. It was super annoying.