Standup comic.

S1E3 - Susie takes Midge to see him at “Upstairs at the Downstairs” to give her an example of a solid mainstream set. Midge gets into a fight with him when he sees her taking notes during his set.

HOWARD: What are you doing? Are you stealing my act?
MIDGE: What? Oh, no.
HOWARD: I am so sick of this. Who sent you?
MIDGE: No one.
HOWARD: Someone out of L.A.? Hired some local girl who knows shorthand?
MIDGE: Hey, I'm not a shorthand girl.
HOWARD: It wasn't Buddy Hackett, was it? Oh, I didn't think he'd dare, not after I flattened him the last time.
MIDGE: No, Buddy Hackett did not…
HOWARD: Dana? Greene? If it was Greene, I swear…
MIDGE: Why do you assume someone sent me?
HOWARD: What?
MIDGE: Why couldn't I be stealing your act for myself?
HOWARD: Are you kidding me? You can't do my act.
MIDGE: What, you think it's so hard? I mean, frankly, other than that stool lean, it's a fairly pedestrian set.
HOWARD: “Fairly pedestrian.” Hackett did send you, didn't he? That motherfucker.
SUSIE: What is happening here?
MIDGE: I am perfectly capable of stealing your act for myself.
SUSIE: Whoa! Nobody's stealing acts here.
MIDGE: And after I stole it, I could do it better. And in heels!
HOWARD: Yeah, yeah?
SUSIE: Okay, we're leaving.
HOWARD: You-you tell Hackett, he shows his face around here again, I'll break his other leg!
– S1E4

4. The Disappointment of the Dionne Quintuplets

• List of Characters