A startling cliffhanger is basically the best thing ever. But you know what makes a cliffhanger even better? When they've figured out how to resolve it already. What are the cliffhangers where it's obvious (or they've admitted) that the writers had no idea how to resolve them?
Please include a clip or picture. And please mention the name of the series, the cliffhanger, and why it seems like they had no idea how to resolve it.
Top image: Star Trek: The Next Generation, "Best of Both Worlds." Probably the most famous cliffhanger which writer Michael Piller has admitted they had no idea whatsoever how to resolve. Of course, this turned out really well in this case — but that's not always true.