The teenager ordered to stay away from
Sarah Palin -- or else -- wants the world to know he's innocent ... in fact, his dad tells TMZ, he'd never be
in this stalker mess to begin with ... if Sarah hadn't texted him first.

It's the craziest story -- the father of 19-year-old
Shawn Christy tells us it all started back in 2009 ... when his son began receiving "ominous" text messages from an unknown number.
According to Shawn's dad, the person sending the texts dropped several hints about her identity, including that she's from Alaska and works in politics ... and for some reason, Shawn believes the culprit was none other than the former governor of Alaska herself.
So why would Palin contact some random guy in Pennsylvania? Shawn's dad couldn't explain that part.