I got an unplanned "young and dumb" summit shiver-bivy story! Back in spring 2009, I was a freshman at CU Boulder, and a fledgling climber. I had about 1 season under my belt of multi-pitch trad climbing, mostly just on stuff in close proximity to Boulder. That April, me and my partner decided to go check out the Black Hills, super excited to go climb in what was then an unknown area for us. My partner had a friend who we stayed with Rapid City. On Saturday we climbed in the Needles; the road was closed and snowed in, so we walked a few miles along the snowy road and had a blast climbing Needles Eye/Tricouni Nail, and some other classics. It was a windy, gray day, and we were the only people out there. We tagged Black Elk Peak (then called Harney Peak) at the end of the day before heading back down to Rapid. A storm came in that night, which dashed our hopes for climbing the next day.
We woke up the next morning to a steady rain, but upon a quick check of the weather, saw that the rain was supposed to stop around midday. We decided to go full YOLO and go give the Tower a try before the long drive back to Boulder.
We arrived at the Tower around noon, just as the clouds parted, the sun came out, and the rock rapidly dried up. We were psyched. My partner had a bit more experience than I did, but not much. We decided to try El Matador, which was a lot harder than anything I had ever climbed before, given the commitment factor. We also only had 1 rope with us. We heard second hand from somewhere that it was possible to rap the Tower using only 1 rope; whatever, we said, good enough for us, we'll wing it! We started climbing at 1pm. That crux second pitch took my partner probably 3 hours to lead. Lots of aiding/backcleaning. By the 4th pitch the sun began slipping behind the horizon, and by the 5th pitch is was totally dark. We summited around 10pm, but we were in good spirits since "all we had to do was rap, and we'd be on our way!" We reveled in being on top of such an awesome feature, even if it was dark and we couldn't see anything. Well, we went over to where we thought this supposed single rope rap route started (somewhere on the east face if memory serves), with my partner going first. A predictable chain of events occurred, with him dangling down in the pitch-black at the end of the rope, looking for rap anchors that weren't there. Then he had to perform the time consuming task of prussiking himself back up the entire rope. After he was back on top, we wandered around aimlessly in the dark up there, trying to find other anchors, with no success. At this point it was probably around midnight, with fatigue setting in. We decided to spoon together in a small semi-protected dip in the grass. As you are aware, a mid April night in northeastern Wyoming can get pretty chilly. We laid there shivering all night, using the rope as a pad/blanket, and my small pack as a foot cozy. I had a sweatshirt, and my partner had a thin puffy, and that was it. It was a pitiful site.
At first light with zero sleep had, we eventually found a rap station in the vicinity of the Meadows rappel and decided to go for it. Surprisingly we were able to get mostly down the Tower with 1 rope, but the last rap to the ground necessitated leaving a couple nuts to rap off. Finally we reached the ground. We stumbled back over to the parking lot, anxious to begin our 6 hour drive back to Boulder; it was a school day after all, and I was already missing classes I did not to be missing. Before we could leave, a Ranger came out of the station and told us to come with him. He led us into the back room and admonished us for spending the night on top, stating how illegal it was, how much he could fine us, etc. We honestly hadn't known about that rule at the time, and we certainly weren't concerned with being in violation of the law after having gone what we went through. The ranger was lenient when he saw that we were just two dumb kids and that this wasn't a planned summit bivy. He let us off with a warning and sent us on our way.
Good early lesson of not starting up a committing/challenging route late in the day with insufficient plans of descent from shady beta. Still, wouldn't trade that experience for anything!