Bad Grandpa
(2013)

Following the antics of Grandpa (Johnny Knoxville) to get Billy (Jackson Nicoll) to his father, the two end up at a bar frequented by a biker crew that protects children's rights.

Billy's father seems like he doesn't care, and Grandpa offers to take care of Billy, after he puts on a hilarious pageant show.

Grandpa dumps Grandma's body over a bridge (as was apparently her wish, "You can throw my body over a bridge for all I care.") And then Grandpa and Billy finally go fishing.

Thanks Herbmeistr!