Alice's Adventures in Wonderland

There was nothing so very remarkable in that, nor did Alice think it so very much out of the way to hear the Rabbit say to itself, Oh dear! Oh dear! I shall be too late! But when the Rabbit actually took a watch out of its waistcoat- pocket and looked at it and then hurried on, Alice started to her feet, for it flashed across her mind that she had never before seen a rabbit with either a waistcoat-pocket, or a watch to take out of it, and, burning with curiosity, she ran across the field after it and was just in time to see it pop down a large rabbit- hole, under the hedge. In another moment, down went Alice after it!

The rabbit-hole went straight on like a tunnel for some way and then dipped suddenly down, so suddenly that Alice had not a moment to think about stopping herself before she found herself falling down what seemed to be a very deep well.