Yeah x2 on the Zombieland recommendation - kodiak and I checked it out opening day, I think, and we both loved it. I am going to see it again in the theater this month!
BUT - I also recommend "Paranormal Activity" - watch it near bedtime like I did and see if you have a creeped out feeling when you climb into bed and pull the covers over you like I did. I had to get back up and secure my squeaky screen door and look everything over before I felt comfortable going back to bed. Not gruesome or scary really there's just a creepy dread that hangs over you.