Fantasies. Funny things.
There's a scene in the British series of The Office, in the Training Day episode.
The character Gareth enters the room, and a workplace trainer says something like "Gareth, quick trust exercise ... ultimate fantasy?"
Gareth, having missed the context of the question because he was absent, reveals an ultimate fantasy that, well, it's not something people often talk about out loud.
Gareth's workmate Tim is asked by the trainer if he would like to contribute. Tim asks if he can hear more from Gareth.
There is one fantasy though that people openly talk about - what would you do if you won Lotto?