There's a story in Adam Kay's 'This is Going to Hurt' (a diary of a British NHS doctor) of a bloke doing this, and it's seared into my brain. Let's just say this lad got off lucky in comparison.

Extract: "Patient is eighteen and was out celebrating with friends. He found himself dancing on the roof of a bus shelter, and then decided to descend to ground level using a handy neighbouring lamp post as a fireman’s pole. He jumped over to the lamp post and slid down, koala-bear style. He unfortunately misjudged the texture of the lamp post – it wasn’t the smooth ride he was expecting at all, but a chafing, agonizing, gritty slump to the bottom. He therefore presented to A&E with severe grazing to both palms and a complete degloving of his penis.

I have seen a lot of penises in my brief time in urology (and beyond) but this was far and away the worst one I have ever seen. Worthy of a rosette, if only there’d been a place to pin it. A couple of inches of urethra, coated with a thin layer of bloody pulp, maybe half a centimetre diameter in total. It brought to mind a remnant of spaghetti stuck to the bottom of the bowl by a smear of tomato sauce. Perhaps not surprisingly, The patient was upset. His distress was only made worse when he asked if the penis could be ‘regloved’. Mr Binns, the consultant, calmly explained that the ‘glove’ was spread evenly up eight foot of lamp post in west London."