The poor boy was scared stiff when he saw a spaceship flying through the sky.
Slang of the day: scared stiff
Meaning: so frightened that you are unable to move
Usage: I was scared stiff when I saw who was at my door.
Dialog:
Mandy – Did you hear the wind howling last night from the hurricane?
Angie – I sure did, I was scared stiff. How about you?
Mandy – Not me, I went to the beach to watch the waves.
Angie – You are nuts.
Mandy – Yup.