  According to Penrose effect, particles with negative energy can exist in the
ergospheres of rotating black holes. We analyze geodesics for such particles
and show that there are no circular and elliptic orbits in the ergosphere of a
rotating black hole. We also show that there are geodesics which begin and
terminate at the singularity and present the conditions under which such
geodesics do not begin and terminate at the singularity.
