In just a sentence or two, ruin a movie for me. If you have to tell what movie it is, you're doing it wrong. I'll start off.
EDIT: No Recent Films, Please*
*So that this thread may be enjoyed by all.
Rosebud is his sled.
Soylent Green is people.
Darth Vader is Luke's father.
The dog dies.
Now you go.
This is why we can't have nice things.