A group of young girls dropped a condom (no, not used, it was still in its original packaging) in my case as they walked by, giggling. The girl I was seeing at the time hated them so I passed it on to a friend at the bar later.

And a fellow picker dropped a nice imitation tortoise shell pleck in the case as he walked by. I kept that one for a while as a good luck charm. I think it's still in the old Sucrets box I keep my extra picks in.