Start here at 1:21, and count: 1-2, 1-2, 1-2, 1-2, 1-2, 1-2, 1-2-3, 1-2...
There used to be a great recording on Don Dorsey giving the history of how this musical anomaly drove everyone nuts. I can't find it now though unfortunately, as it look like the site that uploaded it took it down. Maybe...