  In Randall-Sundrum type scenarios the effective size of the extra dimension
remains unconstrained. A TeV-scale brane tension without orbifold boundary
conditions would allow phenomenologically observable processes at high energy
colliders. Among others, the brane could fragment into bubbles that fly away
for good or return within a time <O(1 mm)/c. Particles trapped on the bubbles
may fake nonconservation of global or electric charges.
  In this letter we explore the generic (model independent) features of these
bubbles. We describe the brane dynamics by a scalar field coupled derivatively
to the energy momentum tensor by dimension-8 operators. Mass is generated to
this field by any brane stabilization mechanism. The bubbles may be stabilized
by the Casimir effect. When the threshold energy of sqrt{s}~brane tension > TeV
is reached, bubbles with 1/TeV size are copiously produced. At lower sqrt{s},
smaller bubbles can be produced (if they exist) with strongly suppressed
probability.
