There was a post about an older dude that went camping with his girlfriend and popped an ol' blue to get freaky. They wrapped up and fell asleep, but the dude woke up 4 hours in excruciating pain - his erection had never gone down. They rushed down the mountain to the hospital, another two hours later... ER docs told him it was too late, amputation time.

So it's always a good idea to stay awake long enough to flush the pipes with a good piss to avoid a uti, the story just reinforced that notion for me about 1000% more.