After a specific series of events I accidentally caused notepad to completely crash. Luckily I remember exactly what happened:
It is obvious why this was a problem, but the program went into complete shut down mode like I have never seen before. When I opened again later all the other files I had opened at the time were gone and some old files were open, so I guess the program reverted to the old data for what files should be open.
Hope this is specific enough. Not a big deal, just thought it could be handled more cleanly.