I babysat a ton growing up so I came to parenthood with a diaper changing strategy. I always put the new unfolded daiper under the butt before I unfasten the old one, just in case. Even when you get prepared, sometimes ninja like reflexes are required.
On one occasion while Riley was still in the hospital we had back to back diaper changes where daddy got peed on one day and a poop fountain the next! You heard me, poop fountain. It was amazing, it went over the side of the crib and hit the chair several inches away as well as the floor (and poor daddy). The NICU nurses who see this kind of thing all the time were still talking (and laughing) about it the next day. Too bad we didn't video that!