It is rude to get someones password without asking them.
Will is bored after a long day of work and doesn't know what to do.
Will wants to watch a good movie or TV show.
Will offers to pay for half the Netflix subscription, so they can share it.
Will gets on his roommate's laptop to get the saved Netflix password.
Will gets to enjoy streaming shows and movies on Netflix for half the price.
Will feels guilty for invaded his roommate's privacy.