Played a few episodes of Rocko's Modern Life for my progeny last weekend after they asked to watch the stuff I did at their age. Nailed the theme song first time despite not having heard it since it originally aired.

That's the thing! I remember a version on that really leaned into the Australian roots of Rocko, it had a digeridoo beginning, and rocko say "Heh, heh, good as new!" But apparently I'm the only person who has this memory! I'm certain it was around when Nickelodeon was doing "The Big Help" campaign.