The idea behind the Pirc is the same as the Scandinavian and Alekhine, an attempt to out-theory your opponent at the expense of making a subpar opening move.
This is why the Sokolsky opening was invented. People were scared to play 1.e4 because they knew their opponent would play a goofy move and out-theory them, so they thought they'd just make the goofy move first and try to do the same thing to Black.
I'm not sure whether posting youtube links is allowed here but anyway, take a look at this - Yasser Seirawan is very humorous!
https://www.youtube.com/watch?v=EJmjt9GGhA8