These are some of my favs
(Bobby on Kerry Von Erich and his Tornado Punch)
Brain: "Oh my, what a GREAT scientific move! A punch to the head!!"
Ross: Virgil is unconscious.
Bobby: When Virgil's unconscious he's usually on his feet talking to you.
"It's very easy to beat the 1-2-3 Kid. You put a glass of milk down and a couple of oreo cookies. When he goes for 'em, put the boots to him."
(From Nitro)
Bischoff to McMichaels: Did you ever play (football) while unconscious
Brain: His whole career!
"The last time I saw Typhoon move like that is when one of those humanoids opened a package of Little Debbie's snack cakes"
Ross: I used to wear bib overalls back in grade school.
Brain: Toughest 18 years of your life, huh?
(During a Pillman/Benoit v. Armstrongs match on Worldwide the Brain had really cracked up Schiavone to the point where Schiavone missed a couple of moves because he was giggling)
Schiavone: "Folks, I apologize for laughing at this man... "
Heenan: "Why? Everybody laughs at Scott Armstrong!"
^^^^^I have that one on tape, it's hillarious when Schiavone can't stop laughing.
(At RR '92, after Piper had just clothesline Jake Roberts as he was about to DDT Flair)
Brain: "I never thought I'd say this, but thank you, Roddy! It's a kilt! It's not a skirt! It's a kilt!"
(And after Piper had just kicked Flair as he had Roberts in the figure four seconds later)
Brain: "Why, you no-good freak! You skirt-wearing freak! It's not a kilt, it's a skirt!"
(During the Shawn Michaels/Marty Jannetty Intercontinental Title match at Royal Rumble 93, Michaels threw Jannetty out of the ring)
Brain: "Shawn, you gotta piledrive him on the steps, break his neck and his shoulders."
Monsoon: "Will you stop!"
Brain: "It's a good amatuer move!"
"What the **** are you doing?"
-- Bobby "The Brain" Heenan to Brian Pillman during a live WCW Clash of the Champions broadcast, January 1996
^^^Classic Loose Cannon moment