The Daring Young Man on the Flying Trapeze

I saw a great movie on the Turner Classic Movie channel called "It Happened One Night".  In the movie while riding in a bus one of the passengers starts singing "The Daring Young Man on the Flying Trapeze".  Some of the other passengers join in.  Now this has very little to do with the plot but it's one of those songs that just stick in your mind playing over and over.