wrote:
Sorry, then.

Somebody slightly more creative than the average NG poster was at work
here, (or it was stolen from some uncredit place). I wondered, "who
has been really quiet throughout all the dung flinging and is capable
of writing this?" You were at the head of a very short list. :-)

Nobody on this NG wrote it. A simple google search (type in the
second line) comes up with amples hits, including:
http://www.unwind.com/jokes-funnies/potty/aimpee.shtml

So, the second option: stolen from uncredited source.

The real problem isn't the aim; it's the half pound of toilet paper!

--
frosty