I’d never sing karoake, but there are somehow multiple videos out there of me singing karoake. It’s really a mystery of how that happened, according to my memory…
It might be hard to tell given all his characters are some level of goofy-looking, but the kid is “normal” and the parents have strangely exaggerated facial features.
Edit: maybe it’s specifically the noses that are supposed to give it away?
Seems like it’s meant to suggest it was a comic idea mailed in by a fan. But, I don’t believe that’s something Larson actually did/does, so the joke is that he takes fan submissions, no matter how absurd - perhaps commentary on his own work not always making sense?