W-Nikkor 35/2.5 wreck!
I had mounted a cone hood to my lens back when it was around 10 degrees F below freezing, and did a shoot downtown where I was using the hood to turn the aperture control ring. The other day I decided to take the hood off, and the whole front assembly came with it!
Luckily, I stopped turning before it disengaged from the lens body. Seems I'll have to tighten the front element back down to keep that from happening again. And maybe buff the threads on the generic hood so they don't grab it so hard the next time.
Waiting for the light