I suppose it depends on what you mean by intentionally--I knowingly no-showed without canceling many times many years ago, but it was because I was too deeply, non-functionally depressed to call and tell her I wasn't coming, not because I didn't want to go or wanted to annoy/frustrate my therapist.

I've never no-showed on my current therapist, or any of the other ones I've seen in the past 10 years or so, though I've definitely cut it close in the past with cancellations in ways that in retrospect were probably some form of "acting out."