Filleting knife ,which I reported to the Police ,just in case it had been used in <Taggart voice > a murder <Taggart Voice> .
Altura cape in a stuff bag ,that I cycled past for a week before picking it up and leaving it on a fencepost ,never moved so I took it and used it for years as my commute back up
Two two pound coins.
A few golf balls
A salmon ,right in the middle of the trail (Cairngorm) well away from any water ,but probably dropped by an Osprey .
I am always more surprised by the random lumps of large metal bits ( car/lorry)at the roadside ,then no broken down vehicle anywhere.