Well, it's happened.
After living here almost 30 years with no problem like this, I think we are being visited by a rodent.
When I went to get a package of breakfast bars out of the "pantry closet",
the bottom of the box had obviously been chewed.
It's bad enough imagining what's in there (I haven't seen anything yet thankfully),
but what really creeps me out is that i cleaned that closet out about 2 weeks ago!
I really think I need to borrow a cat.