The motions of the business world never seem to stop, and so to the amusement. It's fun to watch a public company go private only to become public later. Kraton Polymers is the latest example. Originally part of Shell Chemical, they were spun off, bought out by a private group, and now are going public again with a $230 Million IPO.
The deal that still amuses me is KKR, the giant private equity firm. After spending it's entire corporate life inleverage buyouts and taking companies private, they announced an IPO themselves back in 2007, (although it never came go fruition).