Well you never know what your going to find. About 7 years ago I ran a duct truck cleaning systems, found alot of the normal toys, money, animals, etc. In the 6 months I did this CRAP (nasty work) the strangest thing I ever found was a $20 bill.
When today on an oil service, I pulled out the air filter and found a Uniden portable phone, missing for 6 months. How the hell did it get in there !
This was a great call by the way, dog drap everywhere including in the house.