The interesting thing about this compilation of Pinky and the Brain “Are You Pondering What I’m Pondering?” moments, as others have pointed out, is that if you listen to Pinky long enough, he starts to sound really intelligent. Particularly since what Brain was actually pondering usually turns out to be some stupid plan that will horribly backfire in the end. As always, it’s useful to remember that when the theme song says “One is a genius, the other’s insane,” it doesn’t tell us which one is which.
Also, have you noticed that in every Pinky and the Brain cartoon, they start every sentence by mentioning each other’s name (“Pinky, are you pondering what I’m pondering?” “I think so, Brain”). It’s an old comedy-writing convention that derives from radio, where you had to mention the other person’s name so we’d know who they were speaking to. But on some shows it’s so much a part of the rhythm that I simply couldn’t imagine a Pinky and the Brain cartoon where they don’t say each other’s names all the time.