There are lawyer jokes and there are also judge jokes. A popular lawyer/judge joke is:
 
Q: What do you call a lawyer with an IQ of 50?
A: Your Honor.
 
The joke has been cited in print since at least 1992.
 
   
23 March 1992, The Telegraph (Alton, IL), pg. A-6, col. 3:
Question: What do you call a lawyer with an IQ of 50? Answer: Your honor.
 
Google Books
Corners of Texas
Edited by Francis Edward Abernethy
Nacogdoches, TX: Texas Folklore Society
1993
Pg. 97:
What do you call a lawyer with an IQ less than fifty? Your honor.
 
Google Books
Lawyers from Hell Joke Book
By Ellie Grossman
New York, NY: Signet: New American Library
1993
Pg. 95:
What do you call a lawyer with an I.Q. of 70?
Your Honor!
 
7 October 2003, St. Albans (VT) Messenger, Letters, pg. 4, col. 3:
And by the way, what do you call a lawyer with an OQ of 50? “Your Honor.” Just kidding, but not really.
(Letter by Peter Max of Fairfax.—ed.)
 
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 do you call a lawyer with an IQ of 70?
A: Your Honor.
 
Twitter
Horace Camp
‏@oldfarmhorace
What do you call a lawyer with an IQ of 150? - My Lord
What do you call a lawyer with an IQ of 50? - Chief Minister . OK for #gifadinner? 😉
3:29 AM - 1 Mar 2013
 
Twitter
Reid Bryce Robbins
‏@reidbryce
Q: What do you call a lawyer with an IQ of 100?
A: Your Honor.
Q: What do you call a lawyer with an IQ of 50
A: Senator.
3:49 PM - 5 Aug 2014