That's to enable casual observers
to casually observe the frenzied gash-noshing that goes on in them.

I'd have thought.
( Mr. Tea 'ulmmm'/'mmneurgh', Thu 8 Mar 2012, 9:50, archived)

But I want to whizz in peace.

( Windy Pig I'm naturally quite suspicious about the moon., Thu 8 Mar 2012, 9:54, archived)

They'll probably be happy with you doing it on them,
if my rigorous internet research is anything to go by.
( Mr. Tea 'ulmmm'/'mmneurgh', Thu 8 Mar 2012, 9:57, archived)

oh no,
did I upset them by not pissing on them? WHY DIDN'T I DO MORE RESEARCH BEFORE I WENT!
( Windy Pig I'm naturally quite suspicious about the moon., Thu 8 Mar 2012, 9:58, archived)