“When I told the doctor about my loss of memory, he made me pay in advance”

Several businesses require pay in advance. A popular 1915 joke involves a doctor:
 
She—I saw the doctor today about my loss of memory.
He—What did he do?
She—Made me pay in advance.—London Mail. 
 
“If you’re drinking to forget, please pay in advance” is a related joke.
 
 
Chronicling America
21 May 1915, The Bee (Omaha, NE), pg. 6, col. 6:
She—I saw the doctor today about my loss of memory.
He—What did he do?
She—Made me pay in advance.—London Mail. 
 
8 June 1915, Lexington (KY) Leader, pg. 4, col. 7:
PRECAUTION.
She—I saw the doctor today about my loss of memory.
He—What did he do?
She—Made me pay in advance.—London Mail.
 
Google Books
April 1922, The Spatula, pg. 244, col. 1:
She : ” I saw the doctor today about my loss of memory.”
He: “What did he do?”
She: ” Made me pay in advance.” — The Echo.
 
13 April 1927, Winston-Salem (NC) Journal, “Fun and Fancy,” pg. 6, col. 4:
“I saw the doctor the other day about my loss of memory.”
“What did he say?”
“He made me pay in advance.”—Oil Weekly.
 
Google Books
The Gigantic Joke Book
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
1978
Pg. 157:
Ted: I saw a doctor today about my poor memory.
Ned: What did he do?
Ted: He made me pay in advance.
 
Google Books
Dude, Got Another Joke?
By Bob Phillips
Eugene, OR: Harvest House Publishers
2002
Pg. 125:
Jason: Did you see the doctor about your memory problem?
Jacob: I certainly did.
Jason: Well, what did he do? J
acob: He made me pay in advance.
 
Twitter
Joke of the Day
‏@jokeoftheday69
When I told the doctor about my loss of memory, he made me pay in advance.
8:53 AM - 27 Mar 2015