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 ?
Answer: The bike may not stop and you can run into another vehicle .None of the above choices .The bike might flip backwards and knock our your front teeth .A person may flip over the handlebars when the vehicle halts too abruptly .