Blimey. Prying a nail out of a bit of wood maybe? First attempt to the right of the missing chunk?
Maybe not. I have done much the same to an Anssi 125 blade which I had handled / sheathed in a scandi style. What was I doing? Using a chopping action when gathering some green 2 year old bamboo stems for arrow making. Just like the photo that Brancho posted, I managed to roll a fair bit of the edge, and broke away a small section. I was pretty distraught as it was the first 'good' knife work that I had done. In the end I reground the blade extensively, including taking the rather thin point down to a more rounded profile. The knife is still in use, but rather different from when it was first completed.