It partly depends on what it's rolling on, though. If it's rolling on a low wall, that's a bit less problematic - thought you'd still bruise the hell out of your knees.
"They planned their campaigns just as you might make a splendid piece of harness. It looks very well; and answers very well; until it gets broken; and then you are done for. Now I made my campaigns of ropes. If anything went wrong, I tied a knot; and went on." -- Arthur Wellesley, First Duke of Wellington