I saw this Q&A from J.K. Rowling interview:
Q: Hello, I was wondering how much Tolkien inspired and influenced your writing?
J.K. Rowling responds: Hard to say. I didn't read The Hobbit until after the first Harry book was written, though I read Lord of the Rings when I was nineteen. I think, setting aside the obvious fact that we both use myth and legend, that the similarities are fairly superficial. Tolkien created a whole new mythology, which I would never claim to have done. On the other hand, I think I have better jokes.
... and it dawned on me - I re-read LOTR several times, and I don't remember even a single joke or pun (perhaps Eowyn's "I am no man!" could qualify as such?).
Were there any universally recognized humorous elements in LOTR (the book, not the dwarf-tossing movie)?
(I realize that humour is somewhat subjective, thus the "universally recognized" qualifier above. Something an average reader is likely to find humorous).
An ideal answer would contain one of the following (in order of preference):
A joke that was explicitly acknowledged as one by Tolkien himself
A reference to some research (joke compilation or essay on the topic)
At worst, if no such lists exists, a list of jokes - in other words, if someone posts an answer with a joke and you know of another one, please edit it into an existing answer.