We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Ronald Raygun
saying something like:

Guide dogs are exempt from local pick-up laws, but most are trained to
do it in the gutter anyway.

I suppose doing it on the roof keeps the deposits out of sight.
But hardly out of mind. It'll clog the downpipes, won't it?

There was a thread last week about the necessary fall on the guttering.
At the right speed, it should shoot down the pipe with all the speed of
a speedy thing.