Not a good idea in the presence of others, as they will all invariably start chanting "She fell over!" and push you over again, in a nearby patch of mud where possible. Falling over is an even worse thing to do in the lunch hall, where falling over can result in your lunch being tipped all over the floor and three hundred children laughing at you simultaneously. The headmaster will invariably choose this moment to walk in and randomly give a table of laughing boys detention as you run off crying. (You may recognise the voice of experience in this.)