This is probably the most entertaining grammar I’ve read. (It’s lightweight intermediate Greek.)

David Alan Black. It’s Still Greek to Me: An Easy-to-Understand Guide to Intermediate Greek. Grand Rapids: Baker Books, 1998.

The book ends with a funny footnote (p. 157):

It may appear a bit self-serving to list here so many of my own writings on New Testament studies, but I assure you, dear reader, that all royalties I receive go directly to needy children.

[Footnote] My own.