Modern Magic - Adam

This past weekend as I was driving home from Hiram I had to stop for gas to refuel my car. As I was filling up the car I started to wonder. When you prop the kick stand like lever to the trigger of the gas pump how does it know when you click off? Every car has a different sized tank and every car has different amounts of preexisting gas in the tank how could it know when to click off? Obviously magic is the first and most reasonable response that comes to mind.

Once I arrived home I swung by the Taco Bell near my apartment and as I was getting my order though the drive through window I saw the employee filling a cup with carbonated drink and guess what the machine did...it knew when to click off. How could it know the amount of fizz or the size of cup placed underneath it... again I don't understand how these things function so clearly it is some sort of witchcraft.