Oh man, that operatic episode that summed up the Dexter's life. LABretto I think it was called. Pure Genius.
"Hellllooooo dear brother, what have you got there?"
"Nothing, nothing, you only see air!"
"Don't be silly, I love you very much--*crash* I guess I shouldn't touch~"
Oh, and um, Powerpuff Girls was a much better show.