Having no children, I've never seen Yo Gabba Gabba! and did some research to find out what I've been missing. I think Drew pretty much nailed it back in 2009:

I know another mom who uses a nanny, and part of the contract they made the nanny sign included a clause that forbade the nanny from letting the kid watch this show. That's how much people hate Yo Gabba Gabba. I know it's a cult hit with stoned college kids. But those assholes will watch anything. Yo Gabba Gabba will bore into your skull and strangle all your thoughts. It will give your mind a seizure. I watched one episode once, and was unable to hear my own inner monologue for 40 hours afterwards. Play an episode backward and you will hear the phrase HANG YOURSELF WITH WIRE over and over again.

And now we've got a trippy Metta World Peace cameo to add to the continuing Gabba legacy:

World Peace ran against Toodee, a "blue cat-dragon," and Mrs. Fox, who looks like just as her name suggests. A red cyclops (Muno), a pink flower (Foofa) and a robot (Plex) watched the so-called "Yo Gabba Olympics" with unyielding enthusiasm. World Peace's 8-year-old daughter, Diamond, coached him on the sideline.

The 35-second appearance fit World Peace's goofy personality perfectly. He wore tight, super-short track shorts and high socks with bold stripes. World Peace looked awkward and slow. And moments after crossing the finish line, World Peace warmly embraced Toodee.

Never change, World Peace. Never, ever change.

Metta World Peace races in Nick Jr's "Yo Gabba Gabba" [Los Angeles Times]