20 Things You Somehow Missed In Friday The 13th (1980)
5. Harming Animals
Nowadays, it is normal to see in the end credits of films that "No animals were harmed in the making of this film".
However, this was sadly not the case in Friday the 13th; for the sequence in which several of the camp counsellors crowd into Alice's cabin, cornering a snake so that Bill can kill it with a machete, the death of the snake was performed for real.
Tom Savini suggested the idea and the filmmakers justified it by explaining that they needed an early scene in the film to show that the camp counsellors were actually quite capable of defending themselves.
Although People for the Ethical Treatment of Animals (PETA) was established in 1980, Friday the 13th had been filmed in the summer of 1979, so there was no PETA representative on the set.