There was a brief period of a few generations, several hundred years ago,
(in what are now parts of Russia and the Czech Republic), during which
it was believed by doctors and scientists that blood flow to the head was
of the utmost importance, and thus from a young age, children were taught
to walk on their hands, and most of daily life was carried out upside down.
The entire society was run from the hands up. Everything was made to
conform to the demands of hand walking. Special shoes were created
for the hands. The culture was slowly transformed. Social customs were
changed. The norm slowly, subtly altered itself. In time it was considered
rude to be seen in public walking on one's feet. Only on formal occasions,
such as weddings or funerals, did people concede to walk upright. However,
even on such occasions, small children could still be seen running around
and playing on their hands.

But people generally accepted this with good humor because the children were
young yet and had not learned the ways of the world.