Child’s Play 
The big movie studios of today, with their insane production costs, can CGI a dragon spitting fire on a hobbit village all they want but a scary monster can sometimes be nothing more than an appendage on a stick that you wave in front of the camera. As was the case through most of the 80s and early 90s.
Behind every scary movie monster and behind every nightmare you ever had as a kid there was a team of model makers, costume designers, makeup artists, puppeteers, set designers, cinematographers, actors, stuntmen and of course, the incredible imagination of writers and conceptual illustrators.
Here are some examples of how famous Hollywood movie monsters were made.
Castle Freak 
House 2 
The Fly 
The Ring 
Hellboy 2 
Nightmare on Elm Street 3: The Dream Warriors 
The Terminator 
The Army of Darkness 
An American Werewolf in London 
Total Recall 
The Thing 
That is really cool, and you gotta love the craftsmanship and artistry that was involved in older movies. Sadly, sit’s becoming a forgotten art.