A non-invasive website hit counter

I'm sure that some of you out there will know of a non-invasive (that is, one that doesn't depend on another site) website hit counter. I do not want to have one which has to go to another site, as it's likely that it collects more than your hit statistics. Some of them also serve up ads, which I object to.

If you do, could you give me a pointer to where it is, or a web reference so that I can investigate it myself? A google produced thousands of hits on so-called "free" hit counters, all of which serve up ads.