Monkey Business

"My sources are convinced there's a plot in International Affairs, y'know 'The Agency', and they're using this facility to make a serious nerve toxin...Yeah. Which they plan, in their mind blowing insanity, to let a major terrorist release on a metropolitan area, so they can continue to get funding."

- Steve Haines

Monkey Business is a mission in Grand Theft Auto V, given by FIB agent Steve Haines to protagonists Michael De Santa, Trevor Philips and Franklin Clinton.

Overview
Michael, Dave, and Steve have to dive underwater and infiltrate the IAA base to steal what Steve claims to be "highly dangerous chemicals". They encounter resistance along the way, but Michael tazes them. After they extract the chemicals, they have to escape the base, shooting their way through security and military personnel. IAA Agents arrive at the base but Haines allows Dave and Michael to escape with the neurotoxin by shooting himself in the leg. Trevor returns Patricia to her husband Martin Madrazo, who lost his left ear when Trevor kidnapped Patricia. Martin attempts to apologize to Patricia by giving her a rose, but they knock it out of his hand and Trevor threatens to cut the other ear of if Martin mistreats her. Martin accepts the advice and tells Trevor to thank Michael for his new statue.

Completion - Gold

 * Stunner - Stun 8 enemies with the Stun Gun.
 * Headshots - Kill 15 enemies with a headshot.
 * Accuracy - Finish with a shooting accuracy of at least 70%.
 * Time - Complete within 13:30.

Trivia

 * It is later revealed via a Weazel News radio broadcast that the "dangerous chemicals" were really a new recipe for "cheap perfume" (though this is likely a cover story).
 * When taking Patricia Madrazo back to her husband, the radio will automatically be tuned into Los Santos Rock Radio playing "If You Leave Me Now" by Chicago.
 * While travelling through the secret passage, Michael says that he feels like he's giving the Statue of Happiness a colonoscopy.
 * The mission's name is likely a reference to the Cary Grant/Marilyn Monroe movie of the same name. The movie focuses on a chemist whose chimapanzee inadvertently discovers a youth serum. The mission involves the raid of a chemical plant, inside which the raiders find monkeys used in experimentation.