Welcome Back, Kotter Season 1 Episode 20

Oliver: All right, ten seconds, everyone, break a leg.
Juan: (grabs Oliver) Hey, which leg you want broke, huh?

Oliver: You Kotter?
Gabe: Me Kotter. Who you?

Gabe: Look, nobody could possibly convince a television station to do a Sweathog telethon. Nobody in their right mind would even try.
Vinnie: Sure, but we could try.

Juan: Hey, I got an idea, listen to this. ISB.
Gabe: ISB?
Juan: In-School Betting. Yeah. It's about time we get bettin' off the streets, into the school here, where it belongs! (Sweathogs cheer)
Gabe: Are you kiddin'? I'll lay you 5-2 that'll never happen.
Freddie: I'll take that bet.

Gabe: I got bad news for everybody—no test today. (Sweathogs do mock groaning)
Vinnie: (slams his hand on his desk) You promised!

Horshack: I happen to be a frequent watcher of Channel 52.4. It's right here in Brooklyn.
Kotter: Yeah, I know the channel. The only time I can get it is if I hook my antenna up to my toaster.
Horshack: That's the one.