It took 300 years to build and by the time it was 10% built,
everyone knew it would be a total disaster. But by then the investment
was so big they felt compelled to go on. Since its completion, it has
cost a fortune to maintain and is still in danger of collapsing.
There are at present no plans to replace it, since it was never
really needed in the first place.
I expect every installation has its own pet software which is
analogous to the above.
— K.E. Iverson, on the Leaning Tower of Pisa