She threw wet TP on my ceiling! Just kidding!

Actually, any exterminators/builders/entomologists/pestologists/critterologists on the forum? Dr Fish/Bee?

I just found this thing adorning the bathroom ceiling in the house we just moved into (house is less than 4 years old). I can't get someone here with a tall enough ladder until Sunday so in the meantime I'm fretting about all the things it could be. The picture isn't good but the "The Thing" is bright white against an off-white painted wall. It's about 3-4 inches wide. There was some discussion whether the previous owner's grandkids threw wet TP up there but it doesn't look right. A nest of some kind?

Feel free to make up stories to entertain me while I imagine the worst. Also, just discovered that a pair of flickers is enjoying my attic but I'm less worried about them than The Thing.