Goodbye horse, goodbye horse,
He was saying goodbye to his horse;
And as he was saying goodbye to his horse,
He was saying ggodbye to his horse!
Goodbye horse ...
(Bless 'em all)

We're 'ere ecause we're 'ere because ...
(John Brown's body (I think)

Why are we waiting,
Why are we waiting,
Why ...
(O come, all ye faithful)

Lloyd George knew my father,
Father knew Lloyd George;
Lloyd George knew ...
(Onward, Christian soldiers)

And if you think we've got nothing better to do ... you're absolutely right!

Of course, although these are never-ending, they don't run counter to the "law" of causality. (Despite Stephen Hawking's time-travel-paradox policeman, there's nothing in General Relativity that says you can't do it!)

Steve