  We consider generic axially symmetric rotating spacetimes and examine
particle collisions in the ergoregion. The results are generic and agree with
those obtained in the particular case of the rotating Teo wormhole in N.
Tsukamoto and C. Bambi, Phys. Rev. D 91, 104040 (2015). It is shown that for
sufficiently rapid rotation, the energy of a particle escaping to infinity can
become arbitrary large (so-called super-Penrose process). Moreover, this energy
is typically much larger than the center-of mass energy of colliding particles.
In this sense the situation differs radically from that for collisions near
black holes.
