Back in the 90's I bought myself a scanner to scan all the pics I had taken of my wife over the years. One day my mate asked me if he could scan a couple of pics of his kids. Of course I said ok. What I forgot about was the fact that the scanner software remembers the last photo scanned as a large thumbnail. So as soon as my mate opened the scanner software there was a pic of my very naked wife on display for him to see.
Of course he wanted to see more, but thats another story.