I would argue (and quite hard) that the best umbrella you can get is the one attached to your 07 Rolls Royce, that magically comes out of the door when you press the little button. It's definitely got the best hiding place anyway. However, the most fun umbrella has to be this one - it'll probably not get you safely through security at DIA (or maybe even down any street over here), but it looks fun for a joke on the other side of the Atlantic.
And it even collects the rain and makes the water pistol work - how cool is that? Too cool for Rhianna, that's for sure.