You decide to take the train downtown. When you show up at the station, you realize you don't have any change for the ticket machine. There is a gas station across the street.
There also seems to be no security guards on duty. You can either jump the train and take your chances for four stops, hoping no one asks you for a ticket, or go across the street to the gas station and get change.
If you go to the gas station, you will have to buy something to get change, leaving you with only enough for two beers.
Go to the gas station to get change
Jump the train and take your chances