I was drunk at an outdoor party once and found myself in the situation of simultaneously drinking, smoking, and needing to urinate. With the heightened confidence of superfluous alcohol I told myself that with just two hands I could manage these three things.

So I walked off to find a good pissing tree with a cigarette in my left hand and a beer in my right hand.

I put the cigarette in my mouth and moved the beer to my left hand, with my now free right hand I undid the zip on the my trousers.

I took the cigarette from my mouth with my right hand to get in a normal breath. Then I returned the cigarette to my mouth and took my cock in my right hand to start urinating.

Now as I was looking down to check my stream was suitably directed and that I wasn't just pissing on my shoes, the smoke from my cigarette was getting in my eyes, so I let go of my cock, passed my beer from my left hand to right hand, took the cigarette from my mouth with my now free left hand, passed the bottle from my right hand to my mouth holding it in my mouth, and then returned my right hand to my cock to finish up and shake the drips.

Urination complete and feeling pretty damn cocky with how well I'd navigated the three jobs / two hands dilemma, I got a little over confident and tried to finish up quicker than I should have.

Basically when conducting operations with two hands, one hand is popping my penis back inside my clothes whilst the other is already starting to zip up... However this time, my right hand grabbed the zip and tugged up whilst my left hand stabbed the side of my dick with a lit cigarette, this made me jump and jerk the zip catching my dick skin in my fly, which made me yelp thus making the beer fall from my mouth and spill over my crotch.

Leaving me with a circular burn on my dick, which was still hanging out as I couldn't move the zipper up or down since it was jammed up with cock skin, and beer stained wet trousers that made it look like I pissed myself... And like this I had to head back to the party to find someone I knew who might be able to offer some form of assistance.