Boing Boing: What's on your "To Don't" list?

Boing Boing: What's on your "To Don't" list? I spent another in a long series of meetings with folks at the office yesterday, talking about this very concept. It's a pretty strong trait with technology-oriented folks, the idea that "because I can fix / address / change / do something with technology, I should". Technically possible is one thing, but often these "quick fixes" uncover hidden issues, more little tweaks, etc. -- and these "quick fixes" balloon into Yet Another Legacy System with poor design / documentation / support. It takes a strong will sometimes to say "I can, but I won't".