What Is The Origin Of...

[dave]

Originally Posted by T.G

You know that some semi's have two horns, right?

I wasn't aware.

I only know of three uses for semi horns, so I assume that one is for one specific purpose:

-One is used to scare the crap out of drivers
-The other is used either in response to kids pulling an invisible lanyard in the backseat of a car.....or, alternatively used as a request for women to flash them