Any number of enemas in car while driving, decided this was too indiscreet if not juist plain stupid. Quit 20 plus years ago.
One incident stands out in the driving series. I mixed 8 Fleets with soapy water in a closed top bag. Before getting in the car, I put 2 bananas in me and then a single ballooon 500cc nozzle and blew it up and put on an adult diaper. Threaded the hose through my fly and got into the car, a plastic garbage bag and absorbent pads on the seat. Hung the bag covered by a cleaner's bag on the rear left coathook about 4 feet above my butt. Started what was to be a 30 miles drive on an early Sunday morning with very light traffic. Turned on the enema about mile 3 and by mile 5 was bloating although it took until mile 12 to get the whole bag in. About mile 15 the pressure began to build and at mile 18 I blew out the balloon, the bananas and most of the enema in a long single spurt: I came intenesly in my pants at the same time, hands off.
I thought I was done but the Fleets continued to draw fluid into my colon and for the rest of the drive I expelled and expelled until I returned home. I drove into the garage, messy and smelly but still hard. Rubbed myself though the pants and diaper and came again.
Then the clean up, me and the clothes. The car was not soiled.
This was probably the best enema experience I've had beyond giving my wife her first erotic enema during sex in 50 plus years of enema play, certainly the most intense by myself.