The key to this age old dilemma is as simple as the color red.

The last time you watched a monster movie what color were its eyes?  When the robots in I-Robot went bad what color did they turn?  The Chupacabra?  Yep, red eyes.   If aliens come to earth it won't be the anal probing that gives their evil intent away, it will be their red eyes or their radiating red aura.   Satan?  Always portrayed as red.  Those super hot Hot Tamales candies... yeah, sometimes you get a really really hot one in the bunch.  It was just hiding in there with the others.  It's red.

Red rover red rover.  Need I say more about that?  I don't think so.

The Red Baron, Red October, Red Dawn, Red Sonia ( Whoever wrote that one must have been evil).  Even the Nazi's swastikas were red.

So, the next time you see something red or see someone a little pinker than they should be... Beware!