Monkey's Uncle

Ernie loves apes and Fred collects leaves. And the two of them get together every Saturday to play Chinese checkers. During one of the games, Fred fakes dying of a heart attack. Ernie and his wife, Dottie, put Fred in their son's room and leave to get Harold, Fred's daffy nephew

During their absence their son, Clyde, returns home from college unexpectedly with his girlfriend, Sybil. When Sybil suggests they make love Clyde goes to his room and finds a "stiff" Fred in his bed

He panics, causing Sybil to run out into the night scantily clad thinking she doesn't turn Clyde on anymore. Now Clyde, assuming his dad has knocked off Fred, decides to get rid of the body by exchanging it with a stuffed ape

From this point on it's a whirlwind of apes, leaves, worms, ant farms, blackmail, misunderstandings and madness. But it all comes out in the wash