AMC/Breaking Bad screencap/Netflix
It shows Walter White demanding he be addressed as "Heisenberg," then he suddenly wakes up from a nightmare - filled with weird stories of dealing meth, having a shaved head, and killing people.
"Oh, I knew this was going to happen," his wife chides him. "You grow a beard and all of a sudden you think you're Osama bin Laden."
The clip seems to be a joke ending to the show. The actress playing his wife, Jane Kaczmarek, is from Bryan Cranston's other show - "Malcolm in the Middle."
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As commenter yyZiggurat points out on Reddit, the ending appears to be pretty close to the season finale of Bob Newhart's sitcom "Newhart," which ended in 1990.
Andrew Sims, editor-in-chief at Hypable writes:
Hypable is confident this is the official Breaking Bad "alternate ending" coming on the complete box set for one reason: Malcom in the Middle's Jane Kaczmarek was on the set of the meth drama this past January to shoot a scene for the DVD/Blu-ray box set. No further details had come to light until now.
Now watch the clip:
If you want to see what the actual ending was, you can check it out here.