These two brothers come to America to seek their fortune. They part ways once they arrive, but agree to meet in five years to see how they have fared.
After five years, the brothers meet up. One is poor and one is rich. The rich one became rich by developing a jack off machine that unzips you, jacks you off, cleans you, then zips you back up, at $1 a use.
The poor one says, "Can I borrow your idea?" The rich one says yes, on the condition that he change it up a little so that it's not exactly the same.
Then they agree to meet again in five years.
So five more years pass, and the brothers meet again; this time the poor brother is even richer than the rich brother.
The rich brother asks the newly rich brother, "What did you do with my idea?"
The newly rich brother says, "I used your idea. My machine unzips you and jacks you off for a dollar, but it won't let go until you give it another dollar."