Crocodile tears they're called. But sometimes there's no way to
   tell, even with dry faces, how someone is feeling inside. You
   can stand up in the middle of a speech and be genuinely choked
   up at the recall of a horrible thing. Or you could be acting on
   cue. No real way to know. == Remember the "observer effect": The
   wave function collapses and people automatically behave
   differently in front of a camera. Since our only contact WITH
   them is via the same mechanism that changes behavior, all
   on-camera activities are subject to scrutiny. Observer effect
   also affects people in real life but it's more pronounced the
   larger the audience.