On Mon, 16 Aug 1999 16:22:34 +0200 Gabriele Betti <email@example.com>
> Might it have a connection to the feel of being pushed from the back
> sometimes in certain situations, or other phenomenon?
> have you ever felt it?
That could just be involuntary muscle contractions. Or, if one is sitting upright in a chair with a back, with one's back lightly pressing against the chair back, a monentary loss of the sense of balance could cause one to lean back harder without consciously realizing it. In that case one would feel the chair back pressing on one's back, unexpectedly.