1. A black hole
formed from energie. (They only exist in theory.)
2. Someone so hot
that even science can't understand it.
When the 'planck temperature
' (141,000 billion billion billion K) is reached and even more energie is added, instantly a black hole will be formed. Since the radiation emitted by the planck temperature has the smallest wavelength
possible (1.616*10^-26 nano meters) adding more energie (increasing its temperature) would cause an effect unexplained by science, but is likely to be the creation of a kugelblitz.