The adult film industry makes hundreds of millions of dollars every year for, basically, making smutty rip-offs of already popular movies and television shows.

Back in the 80's, Sylvester Stallone's character of John Rambo from the "First Blood" movie franchise was turned into a porno flick by simply changing the title to "Rambone."  Same thing when Tom Hanks blockbuster "Forrest Gump" was twisted into "Forrest Hump."

Now, apparently, even children's programs are not impervious to the treatment.  Without further ado, enjoy the XXX parody trailer for SpongeKnob SquareNuts. (Possibly NSFW)