By Liam Gilliver A day out to the park can quickly end in disaster. Most children are accident-prone, especially when pumped on playground adrenaline and sugar. Of course, the odd grazed knees from coming off of the swings, or an occasional bruise from falling over, is pretty harmless. They might cry for a couple of seconds but then they get over it, realising they’re now missing out on all the fun. However, a video of a child who appears to break her leg when going down the slide has resulted in mothers issuing a stark warning. Even if you don’t have a little one of your own, it’s worth knowi…