What parodies have taken the place of the original in your mind? Or maybe just made it impossible to watch the original without the parody intruding into your head.
The other day AFN was showing the movie version of Rent. I have been meaning to watch it for a while but never did. Now when I watched it the same song goes through my head the entire time. Everybody has AIDS, AIDS, AIDS!!
Best case has to be Airplane! being much more memorable and enjoyable (and ultimately I think more recognizable) than the Airport movies of the 70s.
And johnspartan nails it in one!
Another good example would be some of the old Warner Brother’s cartoon parodies, particularly What’s Opera Doc.
The Family Guy Star Wars Parody. And I don’t even like Family Guy.
Dr. Strangelove started life as a serious version of “Red Alert” by Terry Southern. It’s also got nearly the same plot as “Failsafe.” It’s endured beyond either one.
I’ll watch Spaceballs over Star Wars any day.
Do songs qualify? There are quite a few Weird Al parodies where I find myself thinking (or even singing) the lyrics to his version if I happen to hear the original.
Topping the list:
“Achy Breaky Song” (although Achy Breaky Heart rarely gets any play nowadays)
“Smells like Nirvana”
“Yoda”
“Bohemian Polka” Ok, Al didn’t change the words, but I’ll mentally insert the accordion playing along with Queen’s performance. 
I personally can’t help replacing the American Pie lyrics with Weird Al’s The Saga Begins. And apparently neither can Don McLean.
A lot of Weird Al’s stuff is more interesting to listen to than the original song, actually. I suppose it depends on whether or not I like the artist in question. He tends to pull the artist’s music more toward himself, which is good when I like him better than the artist but not when I like the artist better than him. I like his rap parodies (dislike most rap), but Grapefruit Diet falls flat for me tune-wise, for example (love Zoot Suit Riot).
Those are good examples. But I am not only looking for things that are better or more enjoyable but ones that creep into your mind when viewing or reading the original. I read Lord of the Rings every few years (I’m due). No matter how many times I read it, Bored of the Rings intrudes into my reading experience.
I’d rather watch Hot Shots Part Duex than Rambo.
Galaxy Quest is better than a majority of the Star Trek films.
Not even close.
I cannot hear “Be Our Guest” without thinking “See My Vest”
It’s widely believed that Airplane! is a parody of the Airport movies generally (and I’m not saying there aren’t direct references), but it’s more specifically a parody of a movie called Zero Hour!
From the 19th century, there are several parodies by Lewis Carroll of what were then well-known poems, but which have become far better-known than the originals. For example,
is much better known than:
I think it’s impossible not to think of **Young Frankenstein **while watching the early Universal Frankenstein movies, particularly Bride of _ (the hermit and the bride) and Son of _ (the overall story and characters).
Exactly. And, in at least a couple of cases, his videos. I can’t watch Michael Jackson’s “Beat It” video without expecting the fat guy to get stuck in the manhole.
And is there anyone nowadays who can listen to Sousa’s Liberty Bell March without anticipating the Monty Python “ppphlbp!”?
The Princess Bride and is better than fairy tales.
Life of Brian is better than Christianity.
Hell, there’s a whole generation of people who can’t look at Citizen Kane without thinking of all the Simpsons parodies.
The Princess Bride is a parody of fairy tales (the movie, I mean; the book is more of a satire) that beats them at their own game.