In Quantum Physics
it is possible for two elementary particles
of opposite charges to spontaneously form. However these particles
normally annihilate one another.
If these two particles were on the edge of a black hole the negative particle could be drawn into the black hole. The positive particle would escape and would appear as radiation from the b/h. As well, after an infinite amount of time, the -ve particles would annihilate the matter in the black hole and cause it to explode.