One popular lawyer joke about a lawyer’s bill is:
 
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
 
The joke has been cited in print since at least 1987.
 
 
Google Books
The Ultimate Lawyers Joke Book
By Larry Wilde
New York, NY: Bantam Books
1987
Pg. 159:
What is it a swan can do easily, a duck can do with little effort, and an attorney should definitely do? Stick his bill up his ass.
       
Google Groups: rec.humor
Lawyer Jokes Needed! 
Robert C. Whitehead
8/7/90
(...) 
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
 
Google Groups: rec.humor
Lawyer Jokes
Ricki Dulin
10/7/92
(...)
Q:  What can a goose do, a duck can’t, and a lawyer should?
A:  Stick his bill up his ass.
 
Google Groups: rec.humor
The Cannonical Collection of Lawyer Jokes
Stephen C. Woods
11/11/93
(...)
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
 
Google Books
The Joke’s On… Lawyers
By Stan D. Ross
Sydney; The Federation Press
1996
Pg. 34:
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
 
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. 37:
What can a goose do, a duck can’t, and a lawyer should?
Stick his bill up his ass.
   
Google Books
The World’s Funniest Lawyer Jokes:
A Caseload of Jurisprudential Jest
By Steven D. Price
New York, NY: Skyhorse Publishing
2011
Pg. 108:
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
   
Twitter
Bob Kostic
‏@causticbob
Q: What can a goose do, a duck can’t, and a lawyer should?
A: Stick his bill up his ass.
3:27 PM - 7 Nov 2015