* Her biggest quirk is talking to herself in the mirror. (This sentence describes a strange or unusual habit.)
* The antique clock had a peculiar quirk – it would only chime on Tuesdays. (This sentence describes a strange or unexpected characteristic.)
* It's a quirk of fate that we met on the same day our parents did, 20 years ago. (This sentence uses "quirk" to refer to a coincidence.)
* His artistic style is full of quirks, which makes his work so unique. (This sentence refers to distinctive features of a style.)
* Even though he's a successful businessman, he has this endearing quirk of always wearing mismatched socks. (This sentence describes a charming or endearing peculiarity.)