Some that haven't been mentioned yet...
Seattle 3-17-75, during the introductions after Sick Again - "A town of great fishermen, including our drummer"
All the Bonzo intros are priceless, really, my favorite being the lengthy one quoted above, from a delay in the show. Then I'd have to go with this one from one of the '75 MD intros - "One of the more gentle men in rock"
Either Vancouver 3-19 or 3-20, as JPJ is taking his sweet time switching between the Fender Rhodes and the clavinet for TUF - "Come on Jonesy, I'm running out of lines here!"
During the same Vancouver shows, in between songs somewhere, to an audience member (I presume) - "Leave the lady alone, will ya?"
During 1975, introducing D&C (honestly don't remember which show) - "This is what you might call an immaculate conception" (or something very close to that)
And - those bratty rock stars! - NYC 2-12-75, after Sick Again:
"Good evening!
I said GOOD EEEEEEEEEVENING!
That's better."
And then, during the ensuing monologue, "you realize we had to walk four blocks in the snow to get here" (and I'm always thinking, yeah and so did the audience lol) - that whole intro is rock star at its best
Just some that came to me immediately, from the shows I've spun recently.