Movie: Zombieland (2009)
It happens: You get comfortable, don't necessarily know how to manage your time, and next thing you know those washboard abs you used to have have turned into waves of fat. Being healthy can be difficult when all you want is a juicy burger with fries, and your idea of working out is walking to the mailbox.
If you've grown comfortable with your extra pounds, that's cool, bro. But losing weight and being healthier contributes to having a happier life. Put the chocolate bar down, or don't. Your choice.