I am a bit of an exhibitionist. With enemas though, I used to tend to be very careful. Now, not so much. Though I don't do them in public, I have done them in my home in front of my roommate, also in front of two different females who were just friends.
I have taken quite a few in semi-public places. At my old apartment complex, in the shower rooms off the gym I took some twice. It was a small changing room with no lock on the door, about 4 shower heads and a couple of alcoves with dressing benches on them. I'd remove my shorts and underwear and take an enema on the bench. Anyone coming in would have nearly instantly seen me, that added to the excitement.
I"ve taken them in all kinds of public restrooms. I've done them often by the river, even in the river. Got walked up on once by some guy on the hiking trail. By the time I noticed him, he'd already seen the whole thing pretty much and was openly staring as he walked by.
Recently I was traveling and pulled over at a freeway rest stop. It was about 2 am so there were few around. I took my gear and marched up to the restrooms, making no effort to try to disguise what I was carrying. As I was filling it at the sink, a couple of guys came in. I calmly screwed the hose attachment onto the combo syringe and carried it into the large handicapped stall.
I proceeded to hang the bag on the door, kicked off my shorts and got into a knee-chest position. I began taking the enema. It wasn't until I was nearly finished that I noticed a dark-skinned, young Latino looking man through the nearly 2-inch gap between the stall door and wall which afforded a perfect view of what I was doing. He was openly staring and stayed even after our eyes met a few times. I didn't move and he stayed until I was nearly done. Someone else entered then and he turned and left.
After expelling, I carried a quarter or half a bag out with me. I was kind of hoping my 'fan' might be waiting for me outside. Unfortunately, he was nowhere to be found. I wound up taking that enema in my truck in the parking lot.