This is in reference to the Scrubs' episode My Day at the Races.
Elliot asks her boyfriend Jake about his wildest fantasy. They go in the bedroom and Elliot comes out shocked after knowing his wildest fantasy. We are not told what it is though.
Even at the end of the episode J.D. asks Elliot about Jake's fantasy but Elliot never tells.
J.D.: Mmmhmm. Will you tell me what Jake's fantasy was?
J.D.: Did it involve chains?
J.D.: Candle wax?
J.D.: Was he a Mexican apple thief?
Elliot: [sighs] If only.
I don't remember any reference to that incident in the later part of the series.
So what was Jake's wildest fantasy? Was there any comment on that from someone related to the show? Or was it just meant to be left for our imagination?