Now this is a bit of sad news "The inventor of the pet rock has passed away http://www.msn.com/en-us/news/us/gary-dahl-creator-of-the-pet-rock-dies-at-78/ar-AAaigSL?ocid=ansnewsap11
I wasn't at all impressed with the pet rock idea... bought one and it died on me, just when I'd gotten attached to it, too.
Took it to the beach with me and it drowned. Like how was I supposed to know it couldn't swim!