  We demonstrate that energy can be transferred very rapidly from the bulk to
the brane through parametric resonance. In a simple realization, we consider a
massless bulk field that interacts only with fields localized on the brane. We
assume an initial field configuration that has the form of a wave-packet moving
towards the brane. During the reflection of the wave-packet by the brane the
localized fields can be excited through parametric resonance. The mechanism is
also applicable to bulk fields with a potential. The rapid energy transfer can
have important cosmological and astrophysical implications.
