One of the best experiences I had that humbled me was getting irritated by the inconvenient/obscure code I was dealing with. It was clever as hell, but impossible to understand and even harder to work on. It wasn't buggy but we needed to add a new feature and it clearly didn't anticipate that. I spent hours cursing the bastard who wrote it. Finally after I was done and checked in the changes, I looked to see who had written the original code. It was me.