Sequels/Prequels to movies you pretend never existed.
There's a thread in GD about the new Star Wars series and the complications that Harrison Ford's injury might create.
One poster, when referring to the Star Wars Episode 1-3 prequels, said he/she simply pretended those never existed.
I have to say there are some movie series where I wish a sequel never existed.
For example, I loved the first Austin Powers movies. I found it genuinely funny and charming. However, the second one was horrible, and the third one, while not as bad as the second, was still pretty bad. I much rather pretend that they left well enough alone.
Blair Witch 2--yeah, that never happened.
Meet the Parents was fun. Meet the Fockers and whatever the third one was called is horrific.
I only saw Airplane 2 once. Because the first Airplane was one of the funniest movies I've ever seen, I've decided never to watch Airplane 2 again.
The Hangover 2 was completely redundant, and the third one really didn't add anything to the mix.
So what about you? What prequels/sequels have you mentally blocked out of your mind in order to preserve the integrity of the original or other films?
I'm sure Indiana Jones 4 is on many a list. The Jaws sequels also. And the Matrix, perhaps?
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Electric Boogaloo.
It had to be done. 
The ad-libbing of those two, and Harold Ramis' uncanny ability to herd cats never ever gets old.
