This happens ALL the time with Chimps. The Chimps you see in movies, on tv shows and commercials are typically about 5 to 8 years old and have been trained since they were babies. By the time they reach teenagehood they become too independent to be handled and either shot or sold to road-side zoos where they live in cages meant for small animals.
Even professional animal handlers and trainers can't handle chimps when they reach this age, what the hell was a geriatric doing with one?
Chimps are very smart and very independent when they grow up and they become very dangerous.
Check out this documentary for some really good and very sad information about chimps: http://www.cbc.ca/fifth/cruelcamera/