Ah...but you have to be there and hear it live. Specially when you haven't heard of it before, and are not in the least expecting anything like it...but are instead expecting another deeply serious and touching song from Eric Bogle about the tragic deaths of young soldiers in the First World War or some other very serious subject like that.

The sheer contrast makes it all the funnier, under those circumstances.

I doubt that it was ever intended to be seen as "a great song". It's intended to be a surprise.