I always imagined it like this:
Suddenly the sky turn black with red streaks, lightning flashes and thunder rolls,
Then a big hole opens in the sky, a big finger is protruding from it, getting lower and lower until it points straigt at my face. Then I hear a deep rumbling voice shaking my entire body, sending waves of shivers down my spine. I know that, whatever the voice says I can't resist it. The voice says : HEY, PSSST! PULL MY FINGER
I wake up screaming.