Finally, one last "Sexpert Franzen" animation not in the film, but used for a promo, and used quite well!
For the technically-minded, the multiple swimmers were NOT arranged by use of particle plug-ins, but rather through careful pre-comping. (I had some experience with this making some bonus material for Disney's special edition of Bambi--all the petals, leaves, and raindrops in the 'year-round screensaver' were all animated and composited by hand, and are all the more natural-looking for it, in my opinion.)