4. Marley & Me (2008)

Marley & Me was pure sentimental genius. We're introduced to two struggling reporters, John (Owen Wilson) and Jenny (Jennifer Aniston), who are attempting to build a family together despite many setbacks, when Marley is brought in as the first member of the family. Only he's not a blessing, he's a complete asshole incapabale of being discipline. 

But somehow, Marley does turn out to be a blessing, albeit one in disguise. His antics act as a source of inspiration for John's newspaper column, and despite his frequent misbehaving, he becomes a source of hard-to-find happiness for the Grogans. It's then, after watching Marley act as the glue for this crumbling family, that he kicks the bucket. WHEN WE GOT SO ATTACHED. We cried. A lot. We're crying as we write this.