“When does a lawyer make coffee?”/“When he has sufficient grounds.”

A coffee riddle has been cited in print since at least 1851:
 
Q: When has a man a right to scold his wife about his coffee?
A: When he has sufficient grounds.
 
This was made into a lawyer joke by at least 2004:
 
Q: When does a lawyer make coffee?
A: When he has sufficient grounds.
   
     
Google Books
1 January 1851, Robert Merry’s Museum, pg. 137, col. 2:
When has a man a right to scold his wife about his coffee?
When he has sufficient grounds.
 
Chronicling America
1 August 1916, Hopkinsville (KY) Kentuckian, pg. 2, col. 4:
When has a man a right to scold his wife about his coffee? When he has sufficient grounds.
 
Google Books
World’s Wackiest Riddle Book
By Evelyn Jones
Illustrations by Dennis Kendrick
New York, NY: Sterling Publishing Company, Inc.
2004
Pg. 12:
When does a lawyer make coffee?
When he has sufficient grounds.
 
Google Books
Old Groaners
Selected and edited by Susan Watkin
Published by author
2006
Pg. 31:
When has a man a right to scold his wife about his coffee?
When he has sufficient grounds.
 
Twitter
Sam McDowell
‏@iamsamiams
@DerrenBrown When does a lawyer make coffee? When he has “sufficient grounds”
10:21 AM - 12 Jan 2010
 
Reddit—Jokes
When does a lawyer make coffee?
submitted January 20, 2017 by CompletePlague
When he has sufficient grounds