My cats are banned from my sewing room. I have one that is obsessed with thread. Meaning he likes to chew it. I think sometimes he's trying to floss his teeth. But it gets stuck on his tongue and he swallows it.
Unfortunately, last year, he had to have emergency surgery. $1500 later, the 10+ lacerations in his intestines were fixed and he is lucky to be alive. The string was found buried under his tongue and throughout this intestines.
Now you can see why he is banned. :wink: