It wasn't originally used for chess, but...
"Never go up against (the) Sicilian when death is on the line!"
A little off topic, but I loved that movie:
'I am Indigo Montoya. You killed my father. Prepare to die!' (from the movie: 'A Princess Bride')
Not a chess quote, but comming from a man who studied ... swordsmanship ... his whole life, to get revenge on the man who killed his father ...
He should have played chess and who knows, he could have been a GM :-)
I'm still going with emo phillips:
"A computer once beat me at chess, but it was no match for me at kick boxing."