I recall a movie I watched more than 10 years ago with this scene in it:
A young and an old man are observing a far away gate through a telescope. The younger one is going to pass the gate and the older one is explaining about the gate to him.
The gate is guarded by two statues. A person is seen trying to pass the gate.
The old man explains if the person who's passing the gate has fear or doubt, the eyes of the statues gradually open and when the eyes are fully opened they shoot a beam of light to the person killing them. The person they are watching is killed.
He continues explanation: But if the person doesn't show any signs of fear or doubt they can pass unharmed (the eyes remain closed).
The younger one then goes to the gate and passes unharmed.