Mind over Bladder

I'd been barbering for many years.  On one particular visit by one of my regular clients, I was telling him how, back in the early days I'd go non stop for eight or ten hours without a break. 

He said, "Not even a washroom break?" 

I said, "Nope, not even a washroom break."

To which he replied, "So, it was kinda like 'mind over bladder' than." 

All in a days work, I thought.  And no, I don't do it that way anymore.