Here's one lesson everyone can learn from because it involves a lot of money. Chinese businessman Li Hejun failed to attend his company's annual shareholder meeting because, according to a spokesperson, he had 'something to do.'

Li is the chairman of Hanergy Thin Film Power and his company has a market cap of $40 billion. But his shares fell over 40% in the last 30 minutes of trading.

Check out the dip!

David Webb, a shareholder activist told Bloomberg:

All directors of listed companies take part in setting the dates of their shareholder meetings, and they should attend. If a chairman of a mainland company did not show up in Hong Kong for the AGM, then it raises questions.

Moral of the story? Don't miss a meeting if you don't have a good enough reason to do so.