Most memorable guest appearance

Maybe Kelsey falls under the same category as the late Phil Hartman, where they've appeared so many times, there really isn't one appearance that stanRAB out.
 
It's probably been said before but N*Sync.

Thrust, Spin, Turn, Pivot, Pout, Jiggy, Jiggy, Robot, Dosee-do and close with a Matrix :lol:

I also love the way they enter, "I can't believe I'm meeting Millhouse, weeerd".
 
Hmm, some good ones have been mentioned here. The baseball players were great. I liked Glenn Close too.

I just watched the one with Mark Hamill and he was great. :lol:

I'm surprised that no one has mentioned Kelsey Grammer. Or does he even count b/c he's done so many?
 
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