CoS Book And Movie Question about the Shop in Knockturn Alley

[xnavyguy73]

> I read The Chamber of Secrets again just after watching the movie,
(on 
> DVD) and have noticed somthing I was wondering if anyone can help 
me 
> out with...  I was watching the deleted scenes and noticed the 
scene 
> where Draco and his father go to the shop on Knockturn Alley, and 
was 
> wondering what item shocked Mr. Borgin, so much, and that prompted 
> Mr.Malfoy to say "that Particular item, is not for sale."??  I have 
> thought about this and can't really place any item that I have seen 
> in the books.  Or have i just missed somthing.  Any help is 
> appreciated