Highly-Trained Monkeys

The Highly-Trained Monkey appears when a 404 or 500 error occurs on YouTube. It is also seen when :oops: is entered in a premiere/live video's chat.
==Occurrences==
The "highly trained monkeys" message was introduced in the 2005-2006 internal server error pages. It is unknown if there was an actual monkey illustration seen on this error.
The error was first widely noted in October 2012, after a possible hack attack or a severe internal malfunction. In April 2018, periodic internal 500 errors left viewers with the monkey and a “Sorry, something went wrong” message. It also occurred in December 2020, especially in Europe and Japan. (Before 2012, a sad/shocked version of the YouTube logo was shown instead of the monkey.)
== Gallery==
File:404Monkey.jpg|The monkey as it appears in the 500 errors
File:Monke404040404404040.png|The monkey as it appears in the 404 errors
File:StubPicture.png|The 500/404 image before the Highly-Trained Monkey was introduced
File:Cara.png|Another 404 image from before the Highly-Trained Monkey was introduced
==References==
Category:History of YouTube