Cartoon: "Hello! You have reached the number of Harold Mayberry. I am sorry, but Mr. Mayberry is not in. I am a simulation of Mr. Mayberry. Please leave your name and number and Mr. Mayberry will call you back when he gets in. Thank you very much!"

From Author Wars - https://authorwars.com/books/cartoon-hello-you-have-reached-the-number-of-harold-mayberry-i-am-sorry-but-mr-mayberry-is-not-in-i-830826.html

Overview:

Title: Cartoon: "Hello! You have reached the number of Harold Mayberry. I am sorry, but Mr. Mayberry is not in. I am a simulation of Mr. Mayberry. Please leave your name and number and Mr. Mayberry will call you back when he gets in. Thank you very much!"
Author: Gahan Wilson
Year: 1973
Type: Interior Art

Editions/Publications:

Unknown. The Magazine of Fantasy and Science Fiction, December 1973 (Unknown, Gahan Wilson, Mercury Press, Inc., $0.75, 164 pages, digest, MAGAZINE)
Unknown. Is Nothing Sacred? (Unknown, Gahan Wilson, St. Martin's/Marek, ISBN-10: 0312437072, $14.95, 127 pages, Hardcover, Collection)

This text has been adapted from the Cartoon: "Hello! You have reached the number of Harold Mayberry. I am sorry, but Mr. Mayberry is not in. I am a simulation of Mr. Mayberry. Please leave your name and number and Mr. Mayberry will call you back when he gets in. Thank you very much!" entry at the Internet Speculative Fiction Database and is available under a Creative Commons License. The ISFDB does not endorse or sponsor this use.