Damaged Hairspring

Take look at this regular and hairspring. I had serviced this watch and returned it to its owner. It was then sent back to me with the complaint that it did not run, in the state shown here. The owner denied touching anything.

The regular is turned to extreme, and the hairspring is yanked clear out of the watch hard enough that it actually broke. It's harder than one might think to break a pocketwatch hairspring, it's steel after all. This damage took significant force.

My first suggestion was that perhaps there was a curious child in the household, but was told this was not the case.

This happened a number of years ago. The owner paid for the additional repair, but maintained ignorance of what had happened throughout.