Standing up from the toilet, I heard a clicking/clattering noise. Thought I saw something in the bottom of the bowl but I checked my pockets and everything seemed to be in order, so I figured it was my badge hitting something. Flush.
Then I remembered the pocketknife --a SOG Flash (the small one) -- clipped to my waistband on the right side. Formerly clipped.
In retrospect, I might not have fished it out, even if I had known -- the assisted opening feature was a little too gimmicky for me.