  We present the first alternative mechanisms to trigger black hole bomb
phenomena beyond the famous superradiant instability. By incorporating
nonlinear self-interaction into the massive charged scalar field in general
relativity, we discover that the allowed static solutions suggest two such
novel dynamic mechanisms, which are further confirmed by our numerical
simulations. The first one originates from the linearly unstable hairy black
hole, but the bomb can be avoided by dialing the coefficient of the tiny scalar
pulse. This distinguishes it from superradiant instability, where the bomb is
an inevitable destiny. The second one is an intrinsically nonlinear process,
which can even drive a linearly stable Reissner-Nordstr\"om black hole to
become a black hole bomb by releasing substantial energy to develop scalar
hair. This is also in sharp contrast with superradiant instability which can
only drive an unstable black hole. These findings not only open up new avenues
for black hole energy burst, but also have potential implications for new
phenomena occurring around astrophysical black holes.
