In a class of its own:
roadkill in the RAIN.   
It's revolting.

Not the rain, that's not revolting in itself,
it's what the rain does to the roadkill …

if you've seen it,
you know what I mean.

And for those of you who haven't,
one thing that may be said is:
no,
the end result is not cleaner than it was --
not on a road with cars, trucks, motorbikes …   ugh.