ShotgunGuide- Official Rules for Calling Shotgun:

SHOTGUN RULES:

Ever have the problem of catching a ride with someone whose car doesn’t have much of a back seat? At times like these, it is important to know the rules of calling shotgun. Never again will you let someone take advantage of you because you don’t know the rules.

Section I – General Rules

1) The first person to yell “SHOTGUN” gets to ride in the front seat.

You’d think this rule was simple enough. But there are more rules for this section, several other sections, and over 40 amendments. You could spend more time arguing about the rules than actually going somewhere!