You make a few assumptions - that Bob bought the shopping, that Bob was short of a few items etc. The reason you know this is because you follow a script unconciously in your head. He asked the waiter for a BMW and left. Example of a Script. Computer is off.
Computer is on.
Computer starts to boot up. Turn off computer. Computer has started, run program needed. To see an example of scripts at work, look at SAM . CR Programs Having said that CR programs are incredibly difficult to program, that doesn't mean such programs don't exist.