Klasky-Csupo/Nickelodeon (2002/2005)
Seen on a Summer 2005 airing of the "Rugrats" episode, "The Perfect Twins".
Both logos got their volume turned down to the point you can barely hear it. It made sense for the Nickelodeon logo to be almost muted because of the announcer, but the Klasky-Csupo logo though?