The guy who went viral for casually eating a salad in the aftermath of the shooting at the White House Correspondents' Dinner is speaking out about his sudden internet fame ... and his appetite. Michael Glantz is the man caught on camera munching on his dinner as the ballroom goes on lockdown ... and he tells TMZ he is glad folks are finding levity from the viral clip after such a "horrific moment." A big-time agent at Creative Artists Agency, Michael says he felt very safe -- the place was