One popular lawyer joke is:
   
Q: What’s the difference between a lawyer and a herd of buffalo?
A: The lawyer charges more.
 
The joke has been cited in print since at least 1992.
 
   
Google Groups: rec.humor
WANTED URGENTLY !! Lawyer/Legal jokes
Lewis Alderton
10/13/92
Q. What’s the difference between a Lawyer and a Herd of Buffalo ??
A. The Lawyer charges more.
   
Google Groups: rec.humor
Canonical List Of Lawyer Humor
He’s Just Into Weird Acronyms
6/23/93
(...)
What’s the difference between a lawyer and a herd of buffalo?
The lawyer charges more.
 
Google Books
The Joke’s On… Lawyers
By Stan D. Ross
Sydney: The Federation Press
1996
Pg. 33:
Q: What is the difference between a lawyer and a herd of buffalo?
A: The lawyer charges more.
 
Google Groups: rec.humor
Lawyers
Debbie Trujillo
11/17/96
(...)
What’s the difference between a lawyer and a herd of buffalo? The lawyer charges more.
 
Google Books
The Lawyer’s Joke Book:
There Are Some Things a Rat Just Won’t Do
By John Patrick Dolan and Dale Irvin
Charleston, SC: Advantage Media Group
2008
Pg. 51:
What’s the difference between a lawyer and a herd of buffalo?
The lawyer charges more.
 
Google Books
The World’s Funniest Lawyer Jokes:
A Caseload of Jurisprudential Jest
By Steven D. Price
New York, NY: Skyhorse Publishing
2011
Pg. ?:
Q: What’s the difference between a lawyer and a herd of buffalo?
A: The lawyer charges more
 
Google Books
Impartial Justice:
The Real Supreme Court Cases that Define the Constitutional Right to a Neutral and Detached Decisionmaker
By Eric T. Kasper
Lanham, MD: Lexington Books
2013
Pg. 102:
Q: What’s the difference between a lawyer and a herd of buffalo?
A: The lawyer charges more.