From the mutant weed in 'Little Shop of Horrors' to the created creatures by Max's mind on 'Where the Wild Things Are'.
This is about every iconic monster that made us feel angry, joy or fear through screens.
For this list don't get too long, there will be only a quick mention of famous franchise such as Alien, Harry Potter and Star Wars (etc) movies to represent the big universe of those "things"...
P.S.: The last ones are the trashes with good memories.