Spontaneous by Aaron Starmer
It's a little gory, but if you can get past the exploding people, this darkly humorous and satirical book will not only make you laugh, but it will also make you think about how our society and media respond to disasters. The main character, Mara, is a snarky and sometimes annoying girl who makes a lot of bad decisions including some inappropriate coping strategies, but she describes the end of the world as she knows it in hilarious detail.
Imagine The Fault in Our Stars with a lot less romance and way more boy humor, movie-making, and inter-racial friendship. The narrator, Greg, says this book "contains precisely zero Important Life Lessons, or Little-Known Facts About Love, or sappy tear-jerking Moments When We Knew We Had Left Our Childhood Behind for Good, or whatever," but it will make you laugh a lot more than it will make you cry (and I do mean a lot).