Any time you complain or hear someone complain, you should immediately be thinking of what you could do to develop a solution. This is where apps are first conceived.

"Object reference not set to an instance of an object."
'Nuff Said.

*finished 4000 lines of code for an application update, vb.net app*
Manager: can we turn this into a Web app instead of a windows forms app?

When a national organization leaves the administrator password on a tool that manages the entire IT Department to the default password.
Also when said default password is publicly documented, known by all trained administrators of this tool, and said tool is exposed to the Internet.