According to the greatest minds
when looking down the drain one finds
that water swirls this way or that
depending on just where you're sat
If the equator northward lies
then water swirls around clockwise
but if the opposite is true
then the equator's south of you
But when I asked these minds so great
for explanation of this trait
they could not quote a single source
or scientist who could endorse
this view and so I'm forced to think
that this idea just comes from drink
and so I now get to the nub...
don't ask these questions in the pub