Not the "most" embarrassing...but up there on the list......
I have lived in a small duplex since 1978, The unit attached to mine is a rental with moderate turnover in tenants. In 1981 when I was 28, a very pretty 20 something who worked in an office for the county moved in next door. During the 1 1/2 yrs she lived there, we became amicable neighbors at ease with each other, she quite often joining me out in the yard on the lawn for flexing exercises after seeing me out there anytime weather permitted and showed an interest.
One day in early fall, I was in day two of four days off, had nothing that I needed to go out to do, had decided to do a series of enemas with my then still in good condition 36Fr 3' long rectal tube. I had set up everything, put on some relaxing music, lay out on the bed and was completely relaxed and into it, had completed two bags with release in-between, I was 3/4 of the way through the third bag when there was an insistent repeated knock at the side door. The windows were open and I yelled I would be there shortly. I closed the clamps, pulled out all 3' of the rectal tube, put on my underwear and a pair of cutoffs and proceeded with tightly clenched rectum to the door. Opening the inside door, there stood my pert/perky/brunette neighbor smiling dressed in exercise top and shorts wanting to know if I was alright since she hadn't seen me out on the lawn at the 'usual' time stretching and would I like to do so now ? I was standing there with 1 3/4 qts of water in me barely suppressing the quivers of the urge to release explaining to this lovely individual that "I will have to pass today" being that I had to finish something that I was doing and I would explain later. She said "OK" with obvious disappointment and left, being that the bathroom is right next to the side door, I immediately shut the door and barely made it to the toilet for an overdue release.
The next day, she had come home from work and I went over with two glasses of chilled white wine and let her know that I didn't intend to be antisocial. We had dated a few times with other couples, there was some "mild chemistry" but nothing that interested either of us to pursue too deeply. While she had a very healthy libido, and dated different people, she was "very Vanilla" and inexperienced when it came to many things. I gently told her that I was in the middle of a series of irrigations using a colon tube also known as a rectal tube to clean out my lower intestine. She said "oh", asked general run-of-the-mill questions with interest, we finished our wine and she thanked me for explaining. Until she moved, we continued to exercise on the lawn as usual and dated a couple of more times. No further interest in enemas was ever expressed by her, after she moved I received a couple of cards from her with the second one inviting me to a house warming she was having in a larger place, She was a good neighbor, yet the incident really had me embarrassed !