Goodbye Uncle Tom (1971)
Two documentary filmmakers go back in time to the pre Civil War American South, to film the slave trade
The Wild Beasts (1984)
The water supply for a large city zoo becomes contaminated with PCP, and the animals go crazy and get loose
Mondo Cane 2 (1963)
The official sequel to the original shockumentary, presenting new and bizarre behavior from around the world, including cruelty, graphic gore, and strange rituals