It's easy for them to draft a parody movie today. At low cost, they choose a few popular movies, borrow and slightly adjust scenes and/or dialogue.
Movies like Weird Al's UHF, Mel Brooks works, or the Zucker Brothers titles actually contain clever, detailed dialogue and original stories/scenes on top of any spoofs they are covering. Using Spaceballs as an example, one of my favorite scenes is the "Then/Now" back & forth between Rick Moranis and George Wyner. Highly comedic, articulate writing, and excellent delivery by the two actors.

It's five years later, society still agrees. Those movies are all still complete trash.
They never should of been made.

Why? Because the people who make those bad parodies rely heavily on gross out humor, Raunch (and I don't mean like what you would find in movies like "Porky's" or "Revenge of the Nerds." ) and gross sex jokes.
Whatever formula Weird Al Uses, it has worked all these years.

This was a great parody movie all right and I enjoyed watching it for the first time in I do not know how many years to be honest with you. The last time I saw this movie on cable TV was back when Comedy Central would show films like this during the day, afternoon and possibly late on Friday and Saturday nights for fun I believe in the 90's.
I watched this for the first time in many years on THIS TV last night at 1:00 in the morning. When I saw that it was on I was like, "Hell yeah I am going to watch this!" I had a great time and enjoyed it too.
Dedicated to USA UP ALL NIGHT and the fans!
http://usaupallnight.webs.com

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For me Airplane! will always be the greatest parody film. Followed by Mel Brooks films and of course this.
Edit: And the Naked Gun, can't forget that (even though I did).
Time to kick bubblegum and chew ass, and I'm all out of ass

Because those movies don't have characters or a story you can give a crap about (and their gags aren't smart-dumb gags, just dumb-dumb gags).
The official website for Whiplash Films:
http://www.whiplashfilm.com/

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Black Dynamite is a great parody.
Whadda you do for a living, sell shoes? Cooka-yayah-o!

Personally I think that the Jared Hess movies (Napolean Dynamite, Nacho Libre, Gentleman Broncos) are the closest comparison to movies today that are similar in caliber to UHF. UHF still being better than the former of course.
"One day my log will have something to say about this."
sanpaco13.blogspot.com

They don't even add fart noises. There's no actual jokes in those movies. Just a montage of things we recognize as things.
UHF is childish brilliance. Or brilliant childishness. Whatever.
There's no justice. There's just me.

Hey, remember this movie from six months ago? Okay, you didn't see it but you saw the preview, right? Well here's a scene from that preview done in exactly the same way except we've added fart noises. You will now laugh and give us money.
"Are you in the army?"
"No man, I just have short hair."

Oh, it's pretty simple. All people want to see anymore is as much profanity, crudeness, and sexual innunendo as possible. We can't go around exposing our teenagers to actual
creative
humor, now could we?
I rather liked Baines. We shared the same bootmaker.

good point and i agree with the previous poster. lately it's just the profit of the movie that matters. you can tell these people had fun making this movie and it was original..unlike the crap that they call parody these days. that's why you skip the new crap and stick to the oldies.
I love the Internet.

If they know that they can make money like you said they will do it for the hell of it to become rich.
Dedicated to USA UP ALL NIGHT and the fans!
http://usaupallnight.webs.com

Because they are desperate for money