I'm a new rider and I ride on the bike lane on the streets around here.
I am so amazed at what I have seen scattered, discarded and lost!

I've noticed things when I run, but riding on the streets is sure more interesting!

Other than the usual detritus and trash, I have seen dead animals (squirrels, skunks and cats), money, clothing, tools, toys and food. Sometimes I wonder about the owners of the lost objects and of course I am sad about the dead critters (but not the skunks, sorry).
I'm sure other riders have seen a lot more strange stuff on their rides!