To keep the line of "it was... so that... happened" another nice excuse is
"My dog ate the manual"
or what about
"my little sister took a bite on the disc and it got screwed, so I downloaded a clone release of it and I can't get it to work. Is there any crack for it?"
Actually one time when I was at my local videogame store there was some dude there trying to get a NWN manual, he told the owner that the manual has been torn apart by his little brother. And so he asked if there was any chance that he could buy just the manual for a lower price than the game...
I can tell you, he did not get any manual..
Keep it coming people