He must have heard there were peanuts and Cracker Jacks...
YouTube Description:4/21/14: A squirrel makes its way onto the field in the bottom of the 2nd inning of the Royals vs. Indians game
Although that squirrel was pretty speedy, it's still not close to being the fastest squirrel to run the baseball field.
Remember Squirrel Man?
YouTube Description:"Squirrel Man," as dubbed by ESPN's SportsCenter, is an NCAA national champion and New York state record holder. The Fastest Squirrel in the World became the "San Diego Squirrel" and "Rally Squirrel" Saturday night (April 27, 2013) when he raced a fan in the stands across the outfield at Petco Park.