Found this paper via @dirkJacobs and maybe you need to be a scientist to think this is funny, but I laughed while reading. Oh, you need to know this paper is written by Goodman, Goodman, Goodman and Goodman.
Goodman, A. C., Goodman, J., Goodman, L., & Goodman, S. (2014). A Few Goodmen: Surname-Sharing Economist Coauthors (No. 168366).
(strangely, the year in Google Scholar is 1969)
The abstract of the paper:
We explore the phenomenon of coauthorship by economists who share a surname. Prior research has included at most three economist coauthors who share a surname. Ours is the first paper to have four economist coauthors who share a surname, as well as the first where such coauthors are unrelated by marriage, blood or current campus.
Oh, btw. You can find this paper via Scholar, but it has no citations.