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Former Mr. Show with Bob and David castmember and current SpongeBob Squarepants voice-actor Tom Kenny is interviewed by The Onion AV Club today. Topics include the cartoon character's permeation through the nation's penal system:

The A.V. Club: On one episode of Lockdown, the National Geographic Channel show about prisons, an officer led a whole cell wing in singing the SpongeBob theme. Has SpongeBob reached a level of ubiquity where you don't even think twice about seeing his face everywhere?

Tom Kenny: Oh no, I think about it. No, I'm constantly still
surprised and awed that he's still ubiquitous, and still getting into
places. Yeah, I wouldn't say that I'm blasé about it. I'm glad that
we're finally reaching what was our intended demographic all along,
which was tough. Convicts. We were just using the children as a gateway
to get to the cons. I guess it just goes to show that now that Johnny
Cash has passed away, SpongeBob has stepped to the floor as prison
inmates' favorite performer. He's the postmodern Johnny Cash. That
means that in 50 years, Rick Rubin is going to re-discover SpongeBob
and make him cool again.

Click here to read the whole interview.