Yes, I have heard these stories and it was just awful!

Someone I know, who loves to bicker, once said they don't want to be buried in a cemetery because they didn't want to spend eternity bickering even there...it is morbid humor but I think they were trying to allay their fear of being buried - for those who are afraid of small, enclosed spaces, that can be a big fear

I once spent 45 minutes in an MRI machine and dang!I thought they forgot about me and left - and even though I had the button to press, somehow it felt like I was trapped and the walls were closing in...