I saw both Metalstorm: The Destruction of Jared-Syn and Spacehunter: Adventures in the Forbidden Zone in the theaters back in the eighties (pray for me), and they were both as good/bad as you might imagine. One of them (I’m not sure which) had the evil mastermind looking at a trio of girls he’d just kidnapped, and cackling to himself, “I hope they don’t have any scars. I hate it when they have scars!”
As for movie secondary titles, you can’t get much better than, “The WRATH of Khan.”
In current production is Sharknado 2: The Second One.
Death Bed: The Bed That Eats People.
Ohgodohgodohgod I wanted to mention that one…
Did you know that you can watch the whole movie in YouTube, in all of its “glory”?
It is as horrid and stupid as it sounds… Although I think that it is rather good to watch it drunk and/or MST3K-ing it with friends.
Beethoven’s Second was kind of a cute name.
I only know of this movie because Patton Oswalt does a bit on this flick in his stand up.
I liked House 2 better than House, for pretty much the reasons you gave. It makes no pretext of being good, it’s just weird fun.
Blondebear’s suggestion of “The Legend Continues” seems to be one we could use like “Electric Boogaloo” and people would understand.
Rambo: First Blood Part II
The Fearless Vampire Killers or: Pardon Me, But Your Teeth Are In My Neck.
APE: Attack of the Giant Horny Gorilla
If I interpret imdb’s listing correctly, in the original theatrical release, “Ape”, “APE”, and “Attack of the Giant Horny Gorilla” were three alternate titles used in different markets. However, I know I have seen a VHS cassette with “APE” as the title, and “Attack of the Giant Horny Gorilla” as the subtitle.