Zappos has a great process for ensuring their corporate culture stays strong, and validating that the people they hire are truly bought into what they are doing:
"After a week or so in this immersive experience, though, it’s time for
what Zappos calls ‘The Offer.’ The fast-growing company, which works
hard to recruit people to join, says to its newest employees: “’f you
quit today, we will pay you for the amount of time you’ve worked, plus
we will offer you a $1,000 bonus.’"
Nice. Here’s a link to the full article from HBS.
(from here)