Besides the one that's the title of this post, there are others. Some are even slightly funny:
What do you get if you cross the Atlantic Ocean with the Titanic? About halfway!
Passenger: How far are we from land?
Captain: Two miles...
Passenger: which direction?
I like these New Yorker-esque Titanic cartoons :-)
Of course, the Titanic theme--full steam ahead into the icebergs with rich unbelieving folks ahead--is used in LOTS of (usually visual) jokes and cartoons.
Comedian Tim Heidecker responded to the news about Bob Dylan's upcoming Titanic song by writing a Bob Dylan-esque song of his own. . . I thought it would be LOL funny, but it's actually a pretty decent knock-off--sounds amazingly like Dylan. I wonder if Dylan's will be as . . . Dylan-ish!
Have a listen here--this is the "short" version.