PHILADELPHIA -- Search "Jake Arrieta bullpen heckler" on YouTube, and you can watch Arrieta throwing pitches in the visitors' bullpen a couple years ago at Citizens Bank Park.
Before Arrieta threw one pitch that evening, a heckler yelled, "Ball!" Arrieta, of course, threw a strike on the black. After the fan made another comment, Arrieta looked behind him and found the culprit, then held up the ball and said, "You want to throw one? Want to throw one?"
The big, bad heckler shut up after that.