When I was really young my firstcat almost died when she swallowed a piece of string she managed to pull from one of my dolls. Luckily my mother realised it and no real harm was done. Now my cats can only play with ribbons and strings under my strict supervision.

The worst are elastic bands. I hide every one in sight but those pest seem to find them anyway. Prema is the worst, if she finds one she starts running all over the place holding it firmly in her mouth, and that little monster is almost impossible to catch.