I’ve always loved the idea of participating in a really awesome flash mob. Britney Spears’ “Slave 4 U” breaks out and 50 of us break it down at Grand Central Station — that’s what I’m talkin’ ’bout. But the above ditty done to PSY’s “Gangnam Style” is seriously the worst flash mob ever. For starters, it’s obvious these folks are up to something. One homegirl continually shrugs her shoulders as if she doesn’t know how to do the pony dance while another laughs with embarrassment. Unless it was your plan was to look dumb in public, y’all failed hard.