Did you spend your school summer vacation playing Mario Brothers on a rented console? I did. It used to cost about 30 rupees for an hour or so.
Now, thanks to some whiz kid that created a Java Applet based emulator for the Nintendo console games you can catch your favourite game here – http://www.virtualnes.com/play/?id=NIN-SM&s=1
Thanks to the above gentlemen, I still get to play my favourite game through the net these days :-)