Very Simple Gambling Game?

I need some ideas for a very simple gambling game. It needs to be something where everyone puts there money (or points) in at the start and one person ends up winning everything. It also needs to be something that is played very quickly (not multiple rounds etc.) And It would be good if it was mostly luck but maybe there is some sort of obscure strategy to win.

So does anyone know of any games like that? Or maybe if you can come up with an original idea That would be great too.

Thanks in advanced!!