it was amazing. they did a 4 and a half-minute
version of "flyswatter" (i don't know if "everyone" was there - they had E,
Butch, Lisa, the bass guy, and someone dressed up as a nun and a guy with a
turbin on).  at the beginning, E picks up his little phone (which he later
uses to play his keyboard with), and says "I am the real Slim Shady".  The
whole time he's wandering around, playing on Lisa's keyboard for a while,
playing his own keyboard then stepping back and then pounding on it again,
just anywhere.  Then, at the end, he gets up and sits on his keyboard, and as
the song is coming to an end, he starts hanging beneath it, with his legs and
his arms on top of the keyboard, still playing it kinda.  then when the song
was over he fell down on the ground.  now usually, david letterman comes out
and shakes the band members' hands, but this time he stayed in his chair by
his desk, asking E if "he was okay over there."