They took turns with it until it got throughly saturated with cat spit (yuck!) which eventually reduced the potency so they weren't lying around on the floor all afternoon with twitching paws, rubbing the bag on their noses.
But that was then. Lately, they've been taking an active role (also roll) in the holiday preparations. For example:
Biscuit kept the Christmas tree branches from getting away while I put the tree up.
There was constant interested supervision while I hung the tree with lights, garland and
I didn't get any pictures of the garland being dragged off the tree and attacked viciously because I was too busy yelling, 'no, stop it, don't eat that!' and removing it from paws and mouths. I did advise my husband to keep an eye out for 'sparkle poo' in the litterbox. He gave me a husband look, and asked (fairly enough), "And then do what?" I'm not entirely sure what the garland's offense was, but the cats tell me, 'it was asking for it'.
There was also a certain amount of removing Biscuit from the tree's lower branches. Several of them are distinctly bent toward the floor now. And the tree decorations stop a foot or so above the bottom of the tree. (After the first few low-hanging ornaments were removed by my decorating consultants, I got the message.) Mom, I'm afraid those glass balls you gave me are not going on the tree this year. I'm sure you understand.
The lovely quilted tree skirt my mother made for me got two paws up, however.
We appear to have achieved a sort of equilibrium, wherein all the ornaments are staying on the tree and the thoroughly cowed garland has withdrawn from floor level. The cats still love to sit under it (which I quite approve of), and JT is busy getting the train set running around the base which should prove entertaining--for someone.