Task: Question Answering
Input (English): Context: One involved a guy who stopped too suddently , flipped his bike and impaled his abdomen on one side of the handle bars and breaks . Another guy also stopped too suddenly , but this time the bike ripped a hole from his groin down to his knee so that his muscle was hanging out . Then one more ( the last one , I promise ) , a girl accidently just used her front breaks so she flew over the handle bars and knocked out all her front teeth . Apparently its on you tube if you 're curious , its called the Toothless Wonder I think . 
Question: Why might it not be a good idea to stop too suddenly while riding a bike ?
Output (English): A person may flip over the handlebars when the vehicle halts too abruptly .