Why was it a mistake to hold it in ? Did Murtle the Turtle put in an appearance during anal play ??
I wouldn't have a great problem with taking a dump midway through a punt though, if the facilities lack extraction, air freshener and a bog brush then what do they expect ? Can't say I've met many females who leave the bog smelling of fresh flowers either so it's not just a male thing.
To answer the question, no I've never taken a dump during a punt, I evacuate some time before a punt, and make sure my ring piece is well polished afterwards. I did have a strung out street prossie get out of the car for a piss and promptly shat herself on route to the bushes. She was amazingly pissed off that I wouldn't let her back in the car for some reason and still called me a cunt after I took pity and gave her my wet wipe supply before driving off. No pleasing some.