No contest, you sabsolutely must see The Point. And yes, I said sabsolutely; my spell checker will not work, okay? You must see it because it answers many deep questions. It still holds up today.
As Nillson said, "I was on acid and I looked at the trees and I realized that they all came to points, and the little branches came to points, and the houses came to point. I thought, 'Oh! Everything has a point, and if it doesn't, then there's a point to it."
Read the Internet. Clearly, most postings prove that you do not need a point to have a point. As Oblio -the only round headed kid in town eventually discovered. The Point, a must-see for the ages. Well, the ages circa 1971.
Then you must see a few good 3D movies, Classics from the Golden Age of Hollywood, anything with John Wayne, all Beatles films, several properly preserved technicolor releases, (IB, a tech thing) and if you can find it, see "The 3Com Production Training Department's Operator's Guide To Setting Up, Running, and Cleaning Cell One Routers." I produced that one, it is a classic and rare.
Seriously, the list of 'Must See' movies is a long one. I suggest you also look at every Cute Kitten videos on You Tube.