15 Day Book Blogger Challenge: Day 4

DAY 4:        The last book I wanted to fling across the room was Pandemonium by Lauren Oliver.  Never in my life has a cliffhanger ever frustrated me more!  Seriously I got to the last sentence and literally screamed "Are You f'ing kidding me?!"   Now, if I hadn't been reading it on my iPad I would have definitely chucked that ish across the room.  But unfortunately I'm poor and can't afford a new ereader, so I restrained myself and settled on angrily slamming the case shut (see people this is why we need to read physical books!)  
I'm starting Requiem today for the BookTubeathon so hopefully that ending doesn't give me the urge to throw it as well.  
What book made you angry?