Select "About Disinfectant", and hold a menu down to pause the advancing virus names while the music plays (to prevent the foot from arriving too soon and stopping the music).
John Norstad appears in one half of the dialog, while in the other half an animated sequence of virus names march out as the Monty Python theme song plays, until they get stomped by a huge foot. Holding down a menu pauses the viruses but not the music, and if you hold the menu down long enough, the entire theme song (John Philip Sousa's "Liberty Bell March") will play! (You may have to release the mouse button every now and then if the music does stop.)
