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As seen in: The X-Files, Lost, Battlestar Galactica, The Leftovers, Heroes, Castle, Babylon 5, Orphan Black, Alias, Person Of Interest ... all those types of shows.

You'll notice that lots of the shows on that list above could also wind up in the "Nonsense Series Finale That Was Clearly Never Intended From The Start" club. That's not a coincidence, and here's why:

Let's say you have to babysit somebody's 5 year old at your place for an evening. You take the task seriously -- babysitting should be like a vacation for the kid, right? You get some snacks and some games you can play together and queue up a bunch of YouTube videos of things being crushed by a hydraulic press (scientifically proven to be fun for all age groups). You've got a whole evening planned!

Hydraulic Press Channel

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The best part is sending the kid to bed and enjoying Hydraulics After Dark.

But then, you get the call from his mother:

"I'm at the hospital; my aunt got bitten by three of her wolves. Can you look after little Xaiden a little while longer?"

"Sure, what time do you think you'll be back?"

"Maybe the day after tomorrow? Or next Thursday? We'll just have to play it by ear."

Yes, your fun evening together has turned into an open-ended affair. Now, think about how shitty day four will be for little Xaiden as compared to the action-packed day one. He'll have gone from seeing a bowling ball get squished by a hydraulic press to seeing a wristwatch. The Cheetos are long gone, and you're now trying to feed him some stale Ritz crackers from a box the previous tenants had left behind the refrigerator. He spent the first night making a pillow fort with his awesome babysitter -- on the fourth, he is handed an iPad with a note that says "It runs on silence." Sure, if you had known from the start it was going to be a week, you probably could have prepared for a fun seven days or maybe spaced things out a bit. But, when there is no definite endpoint, it's nearly impossible.