Ask HN: How do you list bad projects on your resume?

Before I had any kind of professional network to help me find jobs I had to take contract jobs at places like banks. In many cases, the approach to solving problems and technology used was just face-in-palm bad. But as an outsider, I was only there to crank out code and not make decisions.

How do I list experience on a resume in which I don't really want to talk about?