I've had a few providers cancel or ghost me over the years, but easily the worst session I've ever had was with a traveling masseur several years ago (second session -- the first time was OK). His motel was in a somewhat sketchy part of town. I arrived a few minutes early for my Sunday evening appointment and for some reason backed into a parking spot down a bit from his room but within viewing distance (room doors opened to the parking lot).
As I sat in my SUV and waited for my appointment time, his room door opened and two guys walked out, followed by the provider. They chatted for a few minutes, then the two guys walked off. He didn't see me sitting in my SUV.
I should have texted him and cancelled the session, faking illness, but didn't. A few minutes later I knocked on the door and walked into a very messy room. The provider said the two guys were friends of his who were staying with him. The provider appeared to be drunk or high and proceeded to give me a terrible massage using cold hand lotion. After 45 minutes to an hour, he finished me off and asked if there was anything else (forgetting that I had scheduled 90 minutes). I said "No, all good," paid him, and got the hell outta there.
Never again. And I don't think he's been back through Dallas since.