Frodo was beginning to get very tired of living with his uncle Bilbo in Hobbiton and of having nothing to do: once or twice he had peeped into the red book in which Bilbo was writing, but he couldn’t make it out and it did not have enough pictures of elves, ‘and what is the use of a book,’ thought Frodo `without pictures of elves?’
So he was considering in his own mind (as well as she could, for the hot day made him feel very sleepy and stupid), whether the pleasure of having an ale with Sam in Bywater would be worth the trouble of getting up and collecting Same, when suddenly a dwarf with a blue hood and walking stick ran close by him.
There was nothing so very remarkable in that; nor did Frodo think it so very much out of the way to hear the Dwarf say to himself, `Oh dear! Oh dear! I shall be late! And Balin will be so angry with me’ (when he thought it over afterwards, it occurred to him that he ought to have wondered at this, but at the time it all seemed quite natural); but when the dwarf actually took a large axe out of its belt, and swung it a few times as if preparing for battle, and then hurried on, Frodo started to his feet, for it flashed across his mind that he had never before seen a Dwarf in Hobbiton with either an axe or a belt to remove it from, and burning with curiosity, he ran across the field after it, and fortunately was just in time to see it pop down a large hole under the hedge.
In another moment down went Frodo after it, never once considering how in the world he was to get out again. The hole went straight on like a tunnel for some way, and then dipped suddenly down, so suddenly that Frodo had not a moment to think about stopping himself before he found himself falling down a very deep well.
Either the well was very deep, or he fell very slowly, for he had plenty of time as he went down to look about him and to wonder what was going to happen next. First, he tried to look down and make out what he was coming to, but it was too dark to see anything; then he looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there he saw maps of Middle Earth and pictures of dragons hung upon pegs. He took down a jar from one of the shelves as he passed; it was labeled `LEMBAS,’ but to his great disappointment it was empty . . . .
From Frodo’s Adventures in Middle Earth, by Lewis Carroll.

I am not sure who did, but it is fantastic!