Use monkeys to describe the weather:

"Its hot enough to boil a monkey's bum" -Monty Python, Philosopher sketch
"Its cold enough to freeze the balls off a brass monkey." -Coloquialism

Use a monkey in a smart retorts:

"And monkeys will fly out of my butt" -Wayne
"I don't give a monkey's toss!" -Coloquialism
"I don't give a monkey's bugger!" -Coloquialism

Find enlightenment through the monkey:

"Sure, you just have to pretend you see the giant glowing blue monkey." - unattributed
"If you write the word monkey a million times, do you start to think you're Shakespeare?" -Steven Wright
"If you had a million Shakespears, could you write like a monkey? -Steven Wright
"You seek leetly monkey!" -Ren Hoek
"There's the three wise monkeys. See no evil, hear no evil and say no evil. Then the fourth with his hands over his parts. Do no evil." - Henry Sewell

Other sayings:

"Life's a barrel of monkeys and I'm at the botton trying to claw my way out." -unattributed
"I think the monkeys at the zoo should have to wear sunglasses so they can't hypnotize you." -unofficialy Jack Handy
This monkey's gone to heaven. -Black Francis

Stories about monkeys:

A Story about Curious George.
The ten little monkeys jumping on the bed.
A story of someone who liked monkeys (maybe too much, what a sick person)

More fun than a barrel of monkeys? You decide.