Until my tonsils were removed, the first couple of years in camp involved a stay in the infirmary.
Apparently on the theory that boys would get "sluggish" lying in bed, an enema was prescribed for anyone who spent the night. The procedure was that we got up made our beds and washed then stood by for inspection. After the check of ear, nails etc Nurse wheeled in a cart with one or more pitchers covered by a towel and a basin with the required number of tubes.
The enema bag was on a hook on the wall by the toilet. Nurse filled the bag to whatever level and called her patient. The curtain was pulled (no separate bathroom--just a partition) and the patient dropped his pj's, turned around and put his hands on the seat. The tube was passed back to front between legs, cheeks were spread and there was a bit of pressure on the anus. In went the tube, no problem. The it went in some more and it seemed like a lot more Seated on the throne the stop was released but controlled by the nurse. I have no idea what if anything besides soap was in it but it sure worked. My urge went up a lot faster than the enema bag collapsed.
"Isn't that enough"
"A little more"
I seemed like a lot more to me. As it got near the end the bag was raised so that the tube was fully extended. When the bag burped the tube was immediately clamped and removed. "You're almost done. It's important for you to hold that for a few minutes. I"ll tell you when to release it. Do you understand?"
"Yes ma'am
While she left me there she was still within ear shot. There was a short splat in the toilet when a real wave hit me. "You hold that young man."
By this time I was really fighting for control, Another splat and " Do you want another enema? You may need one."
"No ma'am. I really don't."
"Then you hold it just a little more."
Finally I could do no more and just exploded. I was worried at first that the enema would be repeated but nothing happened. While there would be other times that first experience in the infirmary was sure one to remember.