tfw your new hire finds a bug you introduced a month ago in a codebase you didn't know they knew about yet
(the face is my "oh i hired the right person" face)
It's hard to handle bug reports from a large number of users who aren't developers. It's difficult for them to make a useful bug report. High quality reports get lost in the noise.
I don't bother filing bugs for most commercial software unless I can frame it as a security bug...