Tolkien was amazing at writing very serious and dramatic scenes that move the reader to tears, but please take a moment to read about Smaug noticing that Bilbo had stolen a single gold cup:

His rage passes description – the sort of rage that is only seen when
rich folk that have more than they can enjoy suddenly lose something that they
have long had but have never before used or wanted.

Not only is Tolkien a wonderful writer, but he also had a great sense of humor, and used it perfectly especially in the Hobbit.