Braking my leg???????

i no this is a realii realiii weird question but how can i brake my leg??? if it helps we have a lot of stairs at our school! but i have to make it look like an accident but i just dont want like a brake where i onlii spend like 2 or 3 weeks in a cast i want a gooood brake maybe getting metal plates in my leg or somethingg!?? thanksss and dont feel like your helping me to innjure myselfff! please answerrr!