  A single real scalar field of spin zero obeying the Klein-Gordon equation in
flat space-time under external conditions is considered in the context of the
spin-statistics connection. An imposed accelerated boundary on the field is
made to become, in the far future, (1) asymptotically inertial and (2)
asymptotically non-inertial (with an infinite acceleration). The constant
acceleration Unruh effect is also considered. The systems involving non-trivial
Bogoliubov transformations contain dynamics which point to commutation
relations. Particles described by in-modes obey the same statistics as
particles described by out-modes. It is found in the non-trivial systems that
the spin-statistics connection can be manifest from the acceleration. The
equation of motion for the boundary which forever emits thermal radiation is
revealed.
