Interfering with a professional sporting event is never a good idea. But in case you needed another reminder, have a look at this fan at AT&T Park on Monday night.
During the Giants-Reds game in San Francisco on Monday, play was halted when a man jumped from the stands and ran along the warning track until he was caught by left field foul line. Security guards wrestled the man to the ground and one guard appeared to drive his knee into the fan's neck.
The man was brought back to his feet -- with half his face covered in dirt -- and removed from the field.
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(H/T to Deadspin)