There are some real classics from British sports commentator, David Coleman, I shall give only one example here as his talent for talking balls is legendary and prolific:
"The game isn't over yet, but I thought
the best team won."
and my current signature, courtesy of the great Clive James (I just love his understatedly dry sense of humour)
"Private enterprises like giant aircraft went badly enough, however, and almost always there came a time when the government had to support them with public funds, pending the day they could go into service and start losing money on a commercial basis."
I shan't bother with any Bushisms, we've most likely done them to death already, but if I was to pick a favourite it would be the onle where he goes on about 'fool me once shame on you...' and gets it completely wrong infront of so many people.
Anything that comes out of Tony Blairs' mouth is a joke already, so take yiour pick 