I also finished the DaVinci Code. It's hard for me to not finish a book.
The Celistine Prophesy, and the Beans of Egypt Maine were two that I found hard going. Poorly written but interesting.

I briefly dated a woman who said she had read all the classics, but after a few well placed questions it became clear that she hadn't read any of them!
I didn't mind the fact that she wasn't a reader, but the pretense turned me off.

Lately I've been reading SARUM a novel of England, and I find it hard going, may not finish it.

I'll probably get murdered for this, but I sometimes wonder about people who learn 85 verse ballads. Are they showing off? They go on and on unaccompanied with such repetion.....what will you leave to your brother John? what will you leave to your second cousin on the side of your babysitters step friend?
Maybe I just don't get it.