The Lion, the Witch, and the Wardrobe
The Queen took from somewhere among her wrappings a very small bottle which looked as if it were made of copper. Then, holding out her arm, she let one drop fall from it on to the snow beside the sledge. Edmund saw the drop for a second in mid-air, shining like a diamond. But the moment it touched the snow there was a hissing sound and there stood a jewelled cup full of something that steamed. (4.16)
At last the Turkish Delight was all finished and Edmund was looking very hard at the empty box and wishing that she would ask him whether he would like some more. Probably the Queen knew quite well what he was thinking; for she knew, though Edmund did not, that this was enchanted Turkish Delight and that anyone who had once tasted it would want more and more of it, and would even, if they were allowed, go on eating it till they killed themselves. (4.21)
"If there really is a door in this house that leads to some other world […] I should not be at all surprised to find that that other world had a separate time of its own; so that however long you stayed there it would never take up any of our time. On the other hand, I don't think many girls of her age would invent that idea for themselves. If she had been pretending, she would have hidden for a reasonable time before coming out and telling her story."
"But do you really mean, Sir," said Peter, "that there could be other worlds – all over the place, just round the corner – like that?"
"Nothing is more probable," said the Professor. (5.38-40)