It seems like just last month I was writing that "Jurassic Park" was coming to Netflix. (*puts finger to earpiece*) Oh, it seems it WAS just last month I wrote that! So, uh, if you had plans to revisit that on Netflix, you better get on that quick as the original three movies will all bail on the Big Red Streaming Monolith at the end of September after a mere two-month stay. 

And they're not the only ones. Both "A Knight's Tale" and "Seabiscuit" will leave at the end of September after just arriving at the beginning of this very month, while "Donnie Brasco," "Schindler's List," "The Devil's Advocate" and "Million Dollar Baby" all lasted barely longer on Netflix, joining its collection in July only to leave before the summer will end. 

Of course, that's not all. Netflix will also lose some of its most notable horror movies – "The Witch," "Train to Busan," "Sinister" and "Insidious" – just in time for Halloween, as well as several kids favorites ("Despicable Me," "Christopher Robin") and multiple just plain ol' great films ("20 Feet from Stardom," "Million Dollar Baby," "Frances Ha," "The Social Network," to name just a few). 

So what's the takeaway from all of this? Streaming services – especially Netflix – are not libraries, and they're certainly not your friends. As more and more studios create their own streaming services, the licensing deals trading movies to Netflix have offered smaller and smaller timeframes – probably to the point no longer even happening as each studio hogs its library to itself and doesn't want to give prime material to rivals like Netflix, which already resembles a TV channel rather than a rental service these days. In short: If you really like a movie, buy a physical copy (at least while you can or, in the case of Netflix Originals, if you can). Because there's no guarantee it'll be on Netflix, or any streaming service, forever. Or even just more than two months.

Oh, anyways, here's the movies and TV shows you'll want to catch before they're gone from Netflix in September. 

Sept. 4

"Christopher Robin"

Sept. 5

"Once Upon a Time" seasons 1-7

Sept. 8

"Norm of the North: King Sized Adventure"

Sept. 10

"The Forgotten"

Sept. 14

"Cold Case Files" season 1

Sept. 15

"Raiders! The Story of the Greatest Fan Film Ever Made"

Sept. 16

"The Witch"

Sept. 17

"Train to Busan"

Sept. 20

"Sarah's Key"

Sept. 21

"Person of Interest" seasons 1-5

"SMOSH: The Movie"

Sept. 22

"20 Feet from Stardom"

Sept. 26

"The Grandmaster"

Sept. 28

"Tucker and Dale vs. Evil"

Sept. 30

"2012"

"40 Days and 40 Nights"

"A Knight's Tale"

"Cheech & Chong Up in Smoke"

"Dear John"

"Despicable Me"

"The Devil's Advocate"

"Donnie Brasco"

"Frances Ha"

"House of the Witch"

"Inside Man"

"Insidious"

"Jurassic Park"

"The Lost World: Jurassic Park"

"Jurassic Park III"

"Menace II Society"

"Million Dollar Baby"

"Mortal Kombat"

"Mud"

"Resident Evil: Afterlife"

"Schindler's List"

"Seabiscuit"

"Sinister"

"The Social Network"

"Starship Troopers"

"Terminator 3: Rise of the Machines"

"Terminator Salvation"

"Zack and Miri Make a Porno"