One of the most unusual things I've found is 4 gallons of coleman camp fuel. It was within a mile of home so I made 2 trips.
I think a lot of small hand tools around here come from 3 scenarios. Working on car and drop tool and it doesn't make it to the ground and vibrates out on the road, Left tool on inner fender,header panel, cowl and it eventually comes loose. Rusted out car trunks in this part of the country.