Yeah, I know...
The Deed Must Be Done Before Shotgun May Be Called
For these rules to work properly, it is essential for you to understand and accept the concept of the "Deed". Shotgun may only be called after the "deed is done". Simply stated, the deed is any activity or objective that directly precedes the ride in the automobile. The deed can be anything ranging from a visit at a friend's house, to a shopping trip at the mall, to a visit to the Grand Canyon. We cannot stress how important this is because this establishes a Shotgun-calling time frame that ensures everyone has an equal chance of recognizing when to call Shotgun.
There is no crime greater than calling Shotgun on Monday in reference to the ride to the concert on Friday. Some people choose to play this way, and they are fools.
Credit: The Official Shotgun Rules
But it was worth a shot. Guess I'm a fool, according to the site above.