Oh dear. I've always been glad that mine weren't the type of cats who'd eat anything. They're fairly cautious.
However, if they decide to eat a length of gift ribbon, that CAN be life threatening. If you notice that's what happened, try to make him puke it out before it gets his intestines in a twist, this is not a pun...Argh, cats.
Damn! I'm glad everything's OK. (I am assuming everything's OK.) XOVio