Greg Farshtey's method of writing when sitting down for the latest BIONICLE story chapter is to think of a cliffhanger, and hope to find a way to resolve it in the next. Not just individual chapters, the stories tend to end in cliffhangers too. On some occasions, this proved to be a reckless idea, since he couldn't resolve them thanks to his busy schedule. In these cases he assumed the villains simply turned back or just didn't find time to carry out any evil plans.
Riders Radio Theater ends almost every single episode with a cliffhanger, even if the first sentence of the next episode shows there wasn't really a cliffhanger at all ("Is that blood on the barber's comb? Tune in next week!" Next week - "Blood? No, this is styling product, see?")
Journey into Space: Discounting the final episode of each season, every episode ends in a cliffhanger.
In Skyblock, but Every 30 Seconds a Random Item Spawns, the second episode ends with Wilbur asking the Sky Gods if they want him to kill New Milo. In the very next episode he kills the chicken they offered as a new pet for him, saying the Sky Gods will not get between him and New Milo.
Unresolved Cliffhangers:
The 52nd and final episode of Nana Moon ends with Master Satellite finding the wand used by Keke to save Moon Haven, with his dialogue and the look on his face implying he wants to use the wand out of an ulterior motive. The cartoon never got renewed for a second season, so we never see what happens afterwards.
Discussed in Terrible Writing Advice. JP says that cliffhangers are one of the best ways to end the story as they leave the audience in suspense. He also says it's best to disregard the fact that there is a big difference between time to turn the page for the next chapter in the book and time it takes for next movie to be released. For executives, he suggests to cancel the series with a cliffhanger.
