Dropped Books

What are books that you started but have stopped reading?

Ayn Rand - Atlas Shrugged
I managed to get around 100 pages in before the utter boredom struck me. I typically try to at least get 1/3 in a book before judging, but I don't want to trudge through 300 more pages to decide if I will continue reading.

I did the exact same with Atlas Shrugged, fuck those trains are boring.

Last book I dropped was "Vampire Academy", a book my GF wanted me to read. I stopped after 5 pages or so because the writing was horrendous.

Before that I stopped reading "A Brief History of Time and Space" by Stephen Hawking about 1/2 through. The book isn't long, only a few hundred pages, but I lost track of all of the information when they started talking about quarks and spinning shit.