NY Giants linebacker Jonathan Casillas should've been a running back -- because it took 5 SECURITY OFFICERS to bring him down during a violent casino clash back in 2012.
We've been making calls for days trying to gather all the info about this crazy video -- and though the details are scarce, here's what we know ...
-- It happened at 6 AM on May 12, 2012 at the Harrah's Casino in Atlantic City
-- Before the video begins, Casillas was pissed ... and walked outside to cool off. You see him throw a potted plant across the valet area.