Description: Everybody makes mistakes. Most of the time they can be fixed.

But as you gain more experience and your projects get larger you enter the dangerous and exotic world of large-scale design, with mistakes so seductive you won't notice until years after you make them, and so dangerous you can't risk fixing them even once you do.

In the style of "You Can't Get There From Here", this talk will cover the theoretical basis of some of the worst design mistakes, and take you on a tour of some the biggest mistakes in the Perl world (including mine).