I thought myself as expert in lots of things, before, when I tried to copy an amazing word that I hardly could remember.
But, the problem came when I was trying to open notepad and save that word (because I felt lazy to pick up my pen off the desk) and in hurry I typed the word in RUN command (windows) and hit return key.
It struck me when I was expecting the notepad to open and later I was shown an error (due to incorrect command in run). This stroke made me forget the particular word that I was thinking of.
I had felt so confident that I spoke to myself and said
"Oh! what have I done? OK, no problem I can retrieve it because I had typed it in run which can be recovered through the drop down menu"
Later, I couldn't recover it because I had directly typed it and NOT copied (Ctrl + C).