The only thing that stops a bad guy with a gun is a good guy with a gun - two examples

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Two Possible Mass Shootings Stopped By Armed Americans

Dec. 19, 2012

As the debate surrounding the proper place of guns in modern America continues, there are stories (understandably overshadowed by the horrific tragedy that occurred last week in Connecticut) that highlight the valuable self-defense aspect of carrying a concealed weapon.
Earlier this month in Casper, Wyo., a man walked into a busy nail salon with the possible intent to rob and harm its patrons. A woman who was getting her nails done at the time saw him pull a weapon and pulled her own.

Here is a report from the Casper Star-Tribune¹:

Police say about 5:30 p.m. on Dec. 3, a man walked into Modern Nails at 2645 E. Second St. and asked a female employee if she wanted to buy some diamonds. The man walked toward the front desk area and the woman replied that she had no money to buy diamonds.
A witness said the man then reached into his coat pocket and began to take out a silver-colored pistol.
At that moment, a woman who was getting her nails done reached into her purse and got her own firearm. Police say the man never fully raised the gun and left the building after seeing the customer had her weapon out.

On Monday, a gunman entered the China Garden Restaurant in San Antonio, Texas, allegedly looking to do harm to an employee of the establishment. When the employee wasn’t there, police report, the man pulled a gun and attempted to open fire on random patrons of the restaurant. When his gun jammed, patrons fled to a movie theater nearby. The gunman followed and was able to shoot one man in the chest before being neutralized by an off-duty sheriff’s deputy² working security at the theater.