I have a few from playing with friends a few years back. But my favorite is when I accidentally made a dick castle.

Generally my method of building castles is finding a nice big hill or cliff, plopping a few towers along the top, and then connecting them up with a big wall. If it was big enough, it'd be an open court yard in the middle. But in this case, it was just a long hallway connecting 3 towers, with the main tower overlooking a sheer cliff face into the plains below. Majestic, glorious, the perfect spot.

My friend had been heckling me about how the shape was a little phallic, but I scoffed at his observations. After a week of building this thing, and finally getting the roof done over the hallway connecting the towers, my friend made a map. And I could deny it no longer. I spent a week constructing a giant cock n balls, with the head threateningly pointed at the village to the east. The map remained proudly displayed in the entryway to our shared base just south of my castle. To a 15 year old, this was peak comedy.

Later my friend burned it down. I still bring up this betrayal to him sometimes.