That everyone just assumes that everyone else has seen.
In alphabetical order.
Avatar
Bull Durham
ET
Deliverance
Die Hard
Fast Times at Ridgemont High
Field of Dreams
Good, the Bad and the Ugly,The
It's a Wonderful Life
Jaws
Lethal Weapon
Matrix, The *
Rocky
Slap Shot
There will be Blood **
Titanic
Top Gun ***
Also, I have never seen anything with Bruce Lee, Only one Dirty Harry movie, and only one James Bond (During high school, my friends and I would go see whatever happened to be playing at the $!.50 theater. That is how I saw "Octopussy," which killed any interest I might have had in seeing any other of the Bond series.)
* I saw a couple of scenes when my friend was showing off his fancy newfangled DVD player. They were awful.
** I know this got great ink, but I hated Magnolia, I wa underwhelmed by Boogie Nights, and I'm just not that eager to sit through, what is it, like 3 1/2 hours to give Paul Thomas Anderson a third strike.
** * I did see part of this at a friend's house. I fell asleep. I don't think I missed much.