I kind of like the way The Blaze summed it all up
“Officers were examining an abandoned item to determine its contents and to move it out of harm’s way when it accidentally discharged,” said the TSA in a statement to ABCNews.com.
Translation: Under-worked and overpaid TSA worker wanted to use a laser pointer to annoy his coworkers. Instead, he pepper-sprayed them.
http://www.theblaze.com/blog/2013/03...-spray-at-jfk/