What the Heck is the 4th Monkey for?

[bodhi]

There are only three monkeys. The fourth monkey is someone's idea of a joke. A funny one, fortunately.

And now I hear Picard declaring: "There. Are. THREE. Monkeys!"

 

[Kida]

My best guess would be 'Sire no evil'.

 

[crazy_monkey1956]

"See no Evil"
"Hear no Evil"
"Speak no Evil"
"Sling no Poo"

I am the 4th Monkey!