Beat me to it.Big Trouble in Little China.
You're welcome.
I would add
Kentucky Fried Movie
Animal House
Caddyshack
One Flew Over the Cuckoo's Nest
Repo Man
Slap Shot
Casablanca
American Graffiti
MASH
Dr. Strangelove
Lonesome Dove (mini-series category)
In the Epic category: any of the 60's war movies with thousands of extras marching around (Battle of Britain, Lawrence of Arabia, Waterloo, War & Peace)
There is overlap with rediscovering Oscar winners and realizing how effin good they were: (LoA, Guns of Navarone, Gone with the Wind, Casablanca,
I've seen every movie listed here so far. Hard to give an Iconic rating. I tend to add extra weighting for quotable lines.