I've had it happen once. I'm still shocked to this day it happened. The whole experience was surreal. They paid me 6 figures, offered the job out of the blue basically on linked in, I started like a week later and then I was assigned basically nothing. I did basically nothing for a 3 month contract and then left. Without pursuing the job, without barely doing anything, and then left without any real comment.
And we're not talking some fluke small company with no controls. This was a fortune 500. The job had no particularly interesting requirements so I guess somebody just said fill the seat for a few months and I was just grabbed. At the time I was doing a lot of international wandering so it was a nice easy refueling top up stateside.