I lost another today. Temporarily, I'm glad to say.
I was walking the long walk from my neighborhood to the Hawthorne neighborhood, reading from a collection of Sylvia Plath poetry. I'd wound up using two bookmarks in it, and a few blocks east of Mount Tabor I realized I only had one bookmark in it.
Luckily, the bookmark was only, um, five or six blocks back, lying on the SE 60th sidewalk. Good, because I could only justify so much retracing of my steps to try and find it.
The bookmark is a cool lenticular picture of a type of desert snake found in the Western U.S.: it seems to move based on how you shift the bookmark around. And it's still mine!