Yes it is Shadow of a Doubt.

My initial intention was:
I enjoy my serial with noir milk for breakfast. It makes it taste very thrilling and my day goes off without a hitch.

Serial as is serial killer. Visit Wiki for details about the killer in the movie.
Noir milk as in film noir…I like my chocolate milk.
Makes it taste very thrilling – Show of a Doubt was considered a thriller.
Hitch – as in Hitchcock. Alfred directed Shadow of a Doubt in 1943.

Mister Data – your go!

I've converted to lurk-ism... hopefully only temporary.