I'm not familiar with the term "stack", but it sounds like something that happened to me last summer. I had been volunteering late at night, and another volunteer offered to drive me home, which I took her up on. I took off my front wheel to load the bike in her car, which required unfastening the brake. When I unloaded it at my house and put the wheel back on, I forgot about the brake. My driveway goes up alongside my house, with a hill rising up to the house on one side, and downhill to the neighbor's driveway on the other. The space between the two driveways is shored up with rocks between 1 and 2 feet wide, dropping about 3 feet.

Well, I got on the bike and started toward the driveway before I realized I hadn't hooked up the brake. I realized it as I tried to slow down to turn into the driveway. I couldn't quite make the turn, tumbled down the rocks, and landed on the neighbors' driveway. I got away with a very small bit of road rash and a lost blinkie (lots of leaves over the rocks), but okay other than that. Luckily, it was late at night, and my ride had already driven off, so no one saw me!