“Disneyland/Disney World is a people trap set by a mouse” is a joke that has been printed on many images. Disneyland opened in California in 1955; Disney World was opened in Florida in 1971.
 
Mickey Mouse is the popular symbol of The Walt Disney Company. The joke was printed in The Saturday Evening Post on June 28, 1958:
 
“One weary-looking visitor, accompanied by a toddler wearing a Mickey Mouse cap, made the classic remark of all time, ‘This is the greatest people trap in the world ever built by a mouse.’”
 
The joke was extended to Walt Disney World in the 1970s. “Disney World, the second greatest people trap ever built by a mouse” was printed in 1972.
   
     
Wikipedia: Disneyland
Disneyland Park, originally Disneyland, is the first of two theme parks built at the Disneyland Resort in Anaheim, California, opened on July 17, 1955. It is the only theme park designed and built under the direct supervision of Walt Disney. It was originally the only attraction on the property; its official name was changed to Disneyland Park to distinguish it from the expanding complex in the 1990s.
 
Wikipedia: Walt Disney World
The Walt Disney World Resort is an entertainment complex in Bay Lake and Lake Buena Vista, Florida, near Orlando and Kissimmee, Florida. Opened on October 1, 1971, the resort is owned and operated by Walt Disney Parks and Resorts, a division of The Walt Disney Company. It was initially operated by Walt Disney World Company. The property covers 27,258 acres (43 sq mi; 110 km2), featuring four theme parks, two water parks, twenty-seven themed resort hotels, nine non–Disney hotels, several golf courses, a camping resort, and other entertainment venues, including Disney Springs.
       
Google Books
The Saturday Evening Post
Volume 230  
June 28, 1958
Pg. 120:
One weary-looking visitor, accompanied by a toddler wearing a Mickey Mouse cap, made the classic remark of all time, “This is the greatest people trap in the world ever built by a mouse.”
 
13 February 1959, Los Angeles (CA) Tribune, pg. 21, col. 5:
NO JOKE
“Disneyland is the only people-trap in the world built by a mouse.” ... From CBS Radio’s “Just Entertainment”
 
12 April 1962, The Christian Science Monitor (Boston, MA), “Celtics Blend Speed, Defense” by Phil Elderkin, pg. 10, col. 7:
Los Angeles
Here, 30 miles south of Disneyland (the greatest people trap ever built by a mouse), ...
 
19 October 1967, Chicago (IL) Tribune, “Good Morning,” sec. 2, pg. 1, col. 6:
Disneyland is the greatest people trap ever built by a mouse.—Philnews
   
10 March 1972, The Christian Science Monitor (Boston, MA), “36-hole Adventureland” by Phil Elderkin, pg. 5, col. 1:
Lake Buena Vista, Fla.
Disney World, the second greatest people trap ever built by a mouse, did not forget the golfer—pro or duffer.
 
26 January 1975, Chicago (IL) Tribune, “Travel smiles,” sec. 4, pg. 15, col. 1:
WALT DISNEY WORLD: A people-trap built and run by a mouse.
David Majewski
Chicago
 
Twitter
Twila Marie‏
@twila_zoned
Isn’t Disneyland a people trap operated by a mouse?
4:30 PM - 5 Jun 2007
 
WeKnowMemes
A People Trap Set By A Mouse
– SEPTEMBER 1, 2013
POSTED IN: MEMES, PICS
The Irony of Disneyland – A people trap set by a mouse
 
Twitter
Bill Murray‏
@BiIIMurray
Disneyland. The world’s biggest people trap, built by a mouse.
2:16 PM - 14 Apr 2014
 
Reddit—Shower Thoughts
Disney World is just a people trap operated by a mouse.
submitted November 15, 2015 by BlackMist87
 
Reddit—Shower Thoughts
Disney World is like a huge people trap that is operated by a mouse.
submitted August 9, 2017 by PM_ME_S_HUSKY_PICS