I know I said I'd wait a day or two, but I lied.

Next up is another all-timer with an incredible list of films: Alfred Hitchcock. Please pick only feature films.
His full-length features are as follows, but note he had a LOT between 1925 and 1940ish...but not many would have seen them. If you have, and one of them is in your top 5, by all means add them. I started with what is considered when he became popular. I have a feeling a lot of the same will be the top five, but the order of the five will be interesting. I also know his movies are old, so not be very many responses to this one. Alas.
The Man Who Knew Too Much
The 39 Steps
The Lady Vanishes
Jamaica Inn
Rebecca
Mr. And Mrs. Smith
Suspicion
Shadow of a Doubt
Lifeboat
Notorious
Rope
Strangers on a Train
Dial M for Murder
Rear Window
The Trouble With Harry
The Man Who Knew Too Much
To Catch A Thief
The Wrong Man
Vertigo
North By Northwest
Psycho
The Birds
Marnie
Torn Curtain
Topaz
Frenzy
Family Plot