A syndrome that consists on not knowing what seat to take... everyday.
If you do not know what seat to take in the movies or at a theater you are okay.
But if you sing about it, cry about or simply be overly-dramatic you might have this syndrome.
This is a serious problem, and you must go to a crack-house.
Me: *waves* Hey Rebecca! Come sit with us!
Rebecca: *looks at three empty spots near me* OMG! AHHH! WHICH SEAT CAN I TAAAAAAAKE?
Me: Um... are you okay? Looks like you have Rebecca Black Syndrome.
Rebecca: Nah, It's just FRIDAY! FRIDAY! GOTTA GET DOWN ON FRIDAY!
Me: *grabs gun and shoots* Mission "It's Not Friday" accomplished.