This television episode refers to:
December 16, 1988
Turtle's cousin Donny has a money making deal for Turtle and Drama, buying a Sandy Koufax jersey at auction, thinking Sandy is on his deathbed, and the value of the jersey will skyrocket when Sandy dies. He needs $50,000 for the auction, but can only come up with $30,000 himself. Drama asks Donny, "So, you need $20,000?", to which Donny replies, "What are you, Rain Man?".