This is especially true when you have sleep-overs. It's actually rather challenging to stay ahead of the curve. They make the mess significantly faster than you can clean it up (; it's in their job description). This is completely supported by science and yet still remains a mystery to this very day. Ask any local parental scientist and they will confirm it.
These pictures may look mild. Trust me, they are. This is after significant clean-up has already been well underway. I couldn't post the originals. That would be asking too much from our viewers. :)