A prank someone does to you that is secretly (or not) your biggest wish in life.
Dude : "Hey did you hear about those guys who helped that little kid with cancer?"
Chick: "No - what happened ?"
Dude: "These cops found out this dying kid wanted to be a policeman, so they went round to his family with a mini-uniform and an electric toy motorbike"
Chick: " No way?"
Dude: "Yeah, they dropped a bliss-BOMB on that family !"