No Bathroom!

From Psychology of Vision Frequently Asked Questions by POV UK's sole trainer, Alex Patchett-Joyce:

The Groundings
The trainer or a staff member will run through the groundings to make sure that everybody agrees to and understands them. They are designed to make the space as safe as possible for everybody’s healing, so do your best to stick to them.
...
9. Stay in the room: remember the section on your Ego? Nine times out of ten, if you suddenly become desperate to pee or leave the room, it is this part of your mind at work, doing its best to avoid the most useful bit of information! Do your best to stay in the room – that way you will get the most out of the training. 

https://psychologyofvision.blogspot.com/2018/01/psychology-of-vision-frequently-asked.html

Here is a fictionalization of a parallel POV cult, and the comparison is funny but also closer than you would think with the Spezzano scam:

https://www.youtube.com/watch?v=EsEz69WVWhI