I think DUmmies equate bathroom breaks with taking a break to get high.

Reminds me of a story from 35 years ago.
A fellow that had worked for me got a job driving a dozer where they were grading for a Nuclear plant. Him and another fellow were push loading pans. They ran two 12 hr. shifts and he was on the day shift. It was hot-hot summer time.
Every day, several times a day, the other fellow would go to the PORTA-POTTY and smoke a joint....smoke just a rolling from the vents. Well, this would put him in a bind trying to keep up with pushing all the pans and he would get further and further behind until at some point there would be several waiting to be push loaded.....and the boss would finally come along to scold him for falling behind on the job.
One day the other dozer driver went to the PORTA-POTTY to smoke another joint....the guy that had worked for me pushed a pile of dirt up against the door so he couldn't get out. It was one of those 100+ degree days and he was cooking in there amongst the foul aromas......

....he said you could him begging to be let out over the sound of all the heavy equipment running... finally the boss comes to see what the problem was.
He asked the guy that had worked for me where the other dozer operator was. He pointed at the PORTA-POTTY and told him he had gone to smoke a another joint as usual and he was tired of being fussed at for the other fellows slackness. The boss told him to go let the fellow out of the PORTA-POTTY so he could fire him. ...he did....instead of pushing the dirt away from the door of the PORTA-POTTY, he just took the dozer blade and flipped the PORTA-POTTY over onto the door and then rolled it over...pouring the other operater and all the foul contents out on the ground.

He worked 2 more years on that job and he said no one would use the PORTA-POTTY's near where he was working....