  We show that a generalised phantom Chaplygin gas can present a future
singularity in a finite future cosmic time. Unlike the big rip singularity,
this singularity happens for a finite scale factor, but like the big rip
singularity, it would also take place at a finite future cosmic time. In
addition, we define a dual of the generalised phantom Chaplygin gas which
satisfies the null energy condition. Then, in a Randall-Sundrum 1 brane-world
scenario, we show that the same kind of singularity at a finite scale factor
arises for a brane filled with a dual of the generalised phantom Chaplygin gas.
