from the Outer Limits:

""There is Nothing Wrong With Your Television Set.
There is nothing wrong with your television set. Do not attempt to adjust the picture. We are controlling the transmission. If we wish to make it louder,
we will bring up the volume. If we wish to make it softer, we will tune it to a whisper. We will control the horizontal. We will control the vertical.
We can roll the image; make it flutter. We can change the focus to a soft blur or sharpen it to crystal clarity. For the next hour, sit quietly and we
will control all that you see and hear. We repeat: there is nothing wrong with your television set. You are about to participate in a great adventure.
You are about to experience the awe and mystery which reaches from the inner mind to the Outer Limits."

(I cheated) :)

From Star trek: "Resistance is futile. You *will be assimilated!!* the Borg

From Heinlein's _Stranger in a Strange Land_: "Front!" Juball Harshaw

Eric Flint's Belisarious series, all through the books, fromValentinian: "mutter, mutter, mutter"

Teresa