I can drive my car blindfolded, but is it a good idea?

After sending yesterday's email, Dave Hall replied with a LinkedIn comment I liked and wanted to share (done with permission):

In theory I can drive my car on the motorway, blind folded while not wearing a seat belt. It sounds really exciting and loads of fun. When something goes wrong it gets really messy.

I tend to think of skipping automated tests in the same way.

Just because you can do something, it doesn't mean you should.