Will Smith must have been referring to movies when he said "parents just don't understand". I remember asking my parents what they thought of Inception. My father is quoted below.
It's pretty much the same as that No Country For Old Men. No one tells you what happens, and it gets stupid when they start walking on the walls.
Confusing plot lines can take away anyone's enjoyment of the film, but having them retell it can entertain others to no end. Take this video, for example, where this guy's mom retells The Matrix. It's absolutely hilarious.