God damned exception

I was late leaving work this evening and I was rushing to close down my applications so that I could shut down my laptop. I closed a Word document and immediately pulled the cable to my second monitor. The following error message popped up:

This isn’t a Photoshop job, it’s a real error message, presumably tucked away in some remote corner of Microsoft Word.

Update:

Turns out it's nothing to do with Word (more's the pity). It's a "feature" of Notepad++, which is my text editor of choice right now. I must have been closing down Notepad++ at the same time as Word.