Yes, that's right, Joan Rivers, writes StockTwits CEO Howard Lindzon, who saw A Piece of Work, the recent documentary on Rivers's life. Rivers, by the way, is now 77.

"Joan wants to be considered an actress, but in my eye she is a fantastic entrepreneur. She may seem unorganized, but she knows what she wants…to be working.…At 75, doing the redeyes and cruises and small towns to perfect her craft and go where her customers are until they come for her. She believes they will. That's an entrepreneur."