Donna: Just because David is geeky doesn't mean his father is.
Kelly: Donna, an avocado doesn't fall too far from the tree.
Summertime by The Troggs
Original UK airdate Saturday May 9th 1992 5.45pm - 6.40pm ITV
This title of this episode is a reference to the quote "Play it again, Sam" from the 1942 movie Casablanca.