I found a 'something' nest in a drawer once. It had the leftover party napkins in (so hadn't been opened for months) and they were all shredded and rolled into a ball. I carefully prodded it, felt light, tore it open - empty.
Cleared out all the drawers in that dresser and didn't find anyone. Searched the room, no more signs of rodent. Figured the cat had caught it.
Moved house some time later, was sorting through a box of nonsense and found chewed fairy lights. Was pulling then out and shouting to DP about 'oh, that bloody mouse must have got in here too!' When said mouse launched itself out of the box into my lap, we'd only bloody moved hhim to the new house! I'm not sure which of us was more surprised!
viques DP had a lodger when we first got together, he only used the toaster, and the rest of the time ate pot noodle type things. He put all sorts of shit in that toaster.
I was cleaning it one day and realised it was teeming with live maggots. Utter boak. So I chucked it in the bin (lodger was out) and the next morning when we got up we found he'd gone looking for it, found it in the tied off binbag outside somehow and dug it out and used it.
Fucking grim.