I took this "rocket science" class where we made a 2-stage rocket w/payload bay. On test day, mine shot up a couple hundred feet, then, as it staged, it turned horizontal (aaa!) and nearly went over the highway.
Problem is, this kid went running for the booster, and ended up jumping on it.
Another kid's went STRAIGHT up, and as it glided down it went right across the highway and into some trees.
My dad once launched one, but the engine died a few feet off the pad, so it tipped horizontal, then re-ignited, and crashed into a hill.