A few years ago I saw a lady accidently drop something. I called her and picked it up to give to her and it happened to be a tampon. She denied it was hers.
In the last couple of years if I see a bin in view and pass some rubbish I pick up the rubbish and put it in the bin. Mind you the other day I picked up two discarded hub caps and they turned out to be too big to go in the bins so I ended up taking them home.