Mystery

Not that I'm accusing anyone of anything but... I play curling and have a special pair of curling shoes. I went to put on the curling shoes for our most recent match and the rubber gripper that goes on the bottom of one shoe to provide traction on the ice, and then comes off of the plastic bottom of the shoe when you are 'throwing' your rock down the ice, was missing.

The only time I take the shoes out of the backpack I use to bring them to the curling club, is before a match. I wouldn't leave the ice after a match without the rubber gripper because it would be difficult to walk from the ice to the exit without it.  This means that a) someone went into my bag at the club and stole the rubber gripper; or b) the boyz, who aren't especially fond of me leaving to play curling, hid it on me somewhere in the house.