You've obviously not met many porn distributors yet.
Because nobody else has said it on this thread, let me jump in and recommend Dungeons and Dragons to anybody that hasn't played it. It's a brilliant game that's cocaine for the imagination. Find some fun, witty people who don't have ADD, and a D&D night is wicked fun.
There are non-DND pen and paper RPGs if the wizards and warriors trope doesn't do it for you. Peter Watts pointed out Eclipse Phase[1] recently if transhumanism/singularity/horror are more your style; the PDF is legally available on various torrent aggregators if you want to try your hand without having to convince a half-dozen friends to shill out for a book.
That said I haven't actually played it yet myself, as others have pointed out getting a group of friends in different zip codes into one session is NP hard.
Not to mention the wonderful mouseguard RPG mentioned in that article. Its not free but its a great introductory product as well as a great game all round
See the real problem with that is I am probably neither fun nor witty and probably wouldn't be able to handle creating a fake world and exploring said world. I couldn't even play WoW when a friend bought me an account (but thats probably more heroin than cocaine).
