I too think that it is a flea egg/worm thing. Pretty common. I can recall two different episodes of this with former, inside cats. I couldn't figure out where the flea eggs came from, as they never ever went outside. Flea eggs can be in dry cat food from what I was told. That's scarey, isn't it?

Keep us posted. I love that Mr. Magoo.

Good luck! Keep those gloves handy.