Children of Men: that is my fav film ever, I remmeber when I first watched it I was so moved I was in tears. Usually love movies but never get emotional, Children of Men however got me. "Strawberry Cough". 28 Days Later, one of Danny Boyles movies.
Other good movies: Train to Busan, The Road, Cloverfield, 10 Cloverfield Lane, Shaun of The Dead, Sunshine (about a space crew in the future trying to stop an impending apocalypse as the sun is dying), Independence Day. That's what I can think of so far, but amazing shout on Children of Men, a lot of people I know have never seen Children of Men, it's a very underrated film.