What are the worst anti-patterns you have came across in your career as a programmer?

I'm mostly involved in java, although it is probably language-independent.

I think the worst of it is what I call the main anti-pattern. It means program consisting of single, extremely big class (sometimes accompanied with a pair of little classes) which contains all logic. Typically with a big loop in which all business logic is contained, sometimes having tens of thousands of lines of code.