Mario: It's a letter from the usual, the princess had been kidnapped... blah, blah, blah... hotels, et cetera, et cetera, rescue her if you can... we all know the drill...
Luigi: Let's not be late; we're scheduled to rescue the princess by 5:00 p.m.
Mario: Yeah, arranging for the princess to be regularly kidnapped and rescued again and again was the best deal we ever made; we can keep making games for decades!