Mom has a collection of very fine cat whiskers.
When my sister Hana the Dog passed away, Mom saved a lock of Hana's fur. What she missed were Hana's whiskers. In all of the 9 years that Hana lived, Mom never saw one of Hana's whiskers that had fallen off.
So when I adopted my Mom and she found one of my whiskers on the pillow one day, Mom decided to start a Prints the Cat Whisker collection.
Hmmm, peculiar or endearing? Or perhaps good training?