We caught Gypsy doing something weird with those milk rings a few months ago. We chased a big load out of the utility closet, where they eventually get chased under the door, and threw them back out in the living room.
About half an hour later, we find Gypsy picking them up and getting her paw through them, so she'* wearing them like bangle bracelets. After she got seven or eight, she'd three-leg it back to her hiding place(the couch), drop them, and chase them under the couch, where Rover couldn't get them(He doesn't fit under the couch.)
That, and she'* figured out the little touch-sensitive reading lamp in my brother'* room. She'll walk in, jump on the bed, tap it on, and then go about her business.