First was quite confused, then when she started digging into her closet asked what she was doing, & she explained that she thought there might be some old potatoes up there from when she moved in. It was her stuff, so I let her empty the closet shelf & find the potatoes. I did find the fan & turn it on, get the trash bags, & help with the disposal. It was gross. They were black, oozing, & very stinky.
Being able to explain the black, oozing, odorousness now doesn't make it any less disgusting. (They got covered, continued respiring, which releases water, which condensed back on them, triggering rooting, & allowing mold growth & decomposition.)