Yeah I've heard of the Up and Down one, I hope I get to see that eventually!
Oh and the phone call sketch is also great for all its in jokes about the opera world! As usual, Sesame Street used jokes that paid off for kids later in life.
Oh my...lol...I was listening to MC radio the other day, and a song came on from the old SS album "The Sesame Street Monsters." This was the last song on the record, "Be Kind to your Neighborhood Monsters." It's a very sweet song, Grover sings about how Herry can't help being so clumsy, Cookie can't help eating so many cookies, and (of course) Grover can't help being so cute! Basically the point of the song was that monsters may seem scary and different, but that doesn't mean they'll hurt you. I always loved that lesson on SS, to face your fears and not automatically be afraid of differences.
Anyway, the song goes on, very touching, all the characters singing together and being kind to monsters. It finally comes to a pleasant end when suddenly a menacing (and strangely familar) voice pops up, laughing loudly and yelling "YEAH, BE NICE TO ME! BE NICE TO ME!" Completely shattering the sentimentality of the moment (though I'm sure his heart was in the right place). Sound like anyone we know? Lol