Here's what I remember:
Boss: Hey, Lefty, come here.
Lefty: Yeah, boss?
Boss: I'm only going to give you this once, and I shouldn't have to say it again.
Lefty: Okay, I'm listening.
Boss: A, B, C
D, E, F
G, H, I, J
K, L, M, N
O, P, Q, R
S, T, U, V
W
X
Y
Z.
You got that?
Lefty: Yeah, I think so.
Boss: O.K., give it back to me.
Lefty: G-g-g-give it back to you?
Boss: (grabs him) That's what I said!
Lefty: O.K., here goes.
Boss: Let's hear it.
Lefty: A, B, C, D
E, F, G, H
I, J, K
L, M...
Boss: M, what?
Lefty: N, yes.
Boss: And don't you forget it!
Lefty: Right. N, O, P
Q, R, S, T
U, V, W
X
Y
Z.
Boss: That's very good, Lefty. You know your alphabet. Here, I have this here lollipop.
Lefty: Is it strawberry or pineapple?
Boss: Oh, this is even better than that.
Lefty: What's that?
(they walk offstage)
It's been a while since I've seen this bit, but that's close to how it went.