In his opening remarks at the Arizona debate, Mitt Romney stepped on his own applause and tried to throw in a Seinfeld reference for cover. Unfortunately, he got the quote and the speaker wrong.
Source: youtube.com
Romney, tonight at the Arizona debate (one he's used before:
"What's the George Costanza line? When they're applauding, you sit down..."
The actual quote (from "Seinfeld" episode 172, "The Burning"):
JERRY: Showmanship, George. When you hit that high note, you say goodnight and walk off.
Source: assets0.ordienetworks.com