Behind successes there are usually cultures.  Cultures are often based on unwritten rules.  Here are a few I like:
Hat tip to Venture Beat:

Sequoia Capital’s $100 rule — If partners at the big-name venture capital firm arrive late to a meeting with an entrepreneur, even by a minute, they have to donate $100 to charity. Entrepreneur Noah Kagan confirms this with partner Michael Moritz.

I hear that the Tampa Bay Lightning have a their team logo printed on the floor of their dressing room. Anyone who walks on it has to pay $150 (or thereabouts)…I’m not sure where the money goes and I don’t really care.  It’s about respect.

I like these rules.