I've done a TERRIBLE thing.
The book was just sitting there unopened on the table all day.
Glowering at me menacingly with a rather scary looking Harry, Ron and Hermione (hope you all say this like me, Hermy-one) flying towards me off the cover.
By midnight I'd had enough... flicked nonchalently through a few pages, furtively looked around and over my shoulder, nobody watching...
so I picked it up and read the end.