I had one too.

 Nowadays, when you're a girl who plays hockey, you collect the used tape that holds up your socks and pads each game and make a tape ball. Back in the day, we had elastics. When we weren't using them for jumpsies ropes, or flicking our brothers, here's what we did. I distinctly remember some guy having an elastic ball so big he couldn't move it. Must look that up, geek that I am.