There's one of those in just about every genre, I think - in action/cop films, yeah, it's probably 'Dirty Harry', in slasher films, it's 'Halloween', in sci-fi, it's either 'Star Wars' or 'Alien', depending on what variety of sci-fi you're talking about. For fantasy in general, it's 'Lord of the Rings', etc. I've often heard it said about these that it's occasionally difficult to view or read them without seeing them as cliched, because the things they do have been copied so many times that you have to keep reminding oneself that no, this is the ORIGINAL.