From Prince of Darkness:

From Childhood’s End by Arthur C. Clarke:
A vast silence lay over the whole world for the space of twenty seconds–though, afterward, no one could believe that the time had been so short. Then the darkness of the great opening seemed to move forward, and Karellen came forth into the sunlight. The boy was sitting on his left arm, the girl on his right. They were both too busy playing with Karellen’s wings to take any notice of the watching multitude.
It was a tribute to the Overlords’ psychology, and to their careful years of preparation, that only a few people fainted. Yet there could have been fewer still, anywhere in the world, who did not feel the ancient terror brush for one awful instant against their minds before reason banished it forever.
There was no mistake. The leathery wings, the little horns, the barbed tail–all were there. The most terrible of all legends had come to life, out of the unknown past. Yet now it stood smiling, in ebon majesty, with the sunlight gleaming upon its tremendous body, and with a human child resting trustfully on either arm.
Additional “Juxtaposition” posts can be found here.