For example, anyone who has ever put coins into a drink machine only to find that the drink does not come out has probably (1) pushed the button again, more forcefully, and (2) pushed several other...

For example, anyone who has ever put coins into a drink machine only to find that the drink does not come out has probably (1) pushed the button again, more forcefully, and (2) pushed several other buttons in an effort to get some kind of response from the machine. If neither of these strategies works, many people may hit or kick the machine itself in an act of aggression.