How about this theory:

  Make one portal on the ground and the other on the ceiling right above it.
Then take a metallic rod that's exactly the same length as the height of
the room, pass it vertically through the portal, and then weld its ends
(iow. the rod gets welded to itself).

  Now the rod can be moved horizontally and vertically, but it cannot be
turned around a horizontal axis (because it stops itself from being turned).
It's effectively an infinite rod. Now let the rod go.

  The rod will start falling. There's nothing stopping it or slowing it
down (even air resistance is virtually inexistent because the rod is
perfectly vertical and falling straight down). At some point it will
reach relativistic speeds, so we get a paradox similar to the so-called
Ehrenfest paradox.

  Putting that paradox aside, when the rod has gained enormous speed
(and consequently a humongous momentum, being a heavy metallic rod and
all), move the portal on the ceiling to another location, eg. a wall.
What happens?

  The only possibility is that we get a so-called portal cut (iow. moving
one end of the portal to another direction causes the rod to be cut),
and the rod will be flung from the new portal at a humongous speed and
with such a tremendous momentum that when it hits something the amount of
energy released can probably be measured in kilotons of TNT (ie. the same
as a nuclear bomb).

  Where is all this energy coming from? Clearly the portal technology itself
must supply this energy in order to transfer matter from one portal to
another, and it was supplying all these kilotons to the rod when it was
falling down. But where does the portal gun get all this energy from?

-- 
                                                          - Warp

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