Back when I first bought my 76, it came with a fiberglass half cab on it, with no weatherstripping.
The top, and the bulkhead were sealed in place with clear silicone caulk. I'd bet that there has to be 3 or 4 tubes worth of it. I spent an entire weekend scraping off the silicone to put the wagon top on it.
My Bronc was caught in a flood a few years before I bought it, so everything was full of silt. The rockers, frame, cowl, floors and more. I bet it took me 3 or 4 years to get it all out.
My wife's rig is kind of funny. The rockers rotted out, so one of the PO's welded in some 16ga c channel in place so that there isn't a void where the rockers were. The DIY bedliner flame job could have been cool, but wasn't finished, and my wife isn't too hip with it, so it goes. I have learned that paint stripper takes it right off though.
Other than the normal spare change/parts/tools that you always find in a vehicle, not much weird stuff in either of mine.