Again,it's not a DVD because they haven't made it available yet, and it's not ideal for tiny children, but I really love Square One TV. There's a lot of humor in it for adults (not crude, just stuff younger kids wouldn't get). Overall it's just really silly. There are a lot of episodes on YouTube. I've been singing "That's Infinity" lately, so I share this sample:
http://www.youtube.com/v/E07owREetJU&rel=1